WASHINGTON » With the simplest of sentences, NBA veteran Jason Collins set aside years of worry and silence to become the first active player in one of four major U.S. professional sports leagues to come out as gay.

In a first-person article posted today on Sports Illustrated’s website, Collins begins: “I’m a 34-year-old NBA center. I’m black. And I’m gay.”

Collins has played for six teams in 12 seasons, most recently as a reserve with the Washington Wizards after a midseason trade from the Boston Celtics. He is now a free agent and wants to keep playing in the NBA.

“I didn’t set out to be the first openly gay athlete playing in a major American team sport. But since I am, I’m happy to start the conversation. I wish I wasn’t the kid in the classroom raising his hand and saying, ‘I’m different,'” Collins writes. “If I had my way, someone else would have already done this. Nobody has, which is why I’m raising my hand.”

Saying he had “endured years of misery and gone to enormous lengths to live a lie,” Collins immediately drew support for his announcement from the White House — President Barack Obama called him — along with former President Bill Clinton, the NBA, current and former teammates, a sponsor, and athletes in other sports.

Los Angeles Lakers star Kobe Bryant tweeted that he was proud of Collins, writing: “Don’t suffocate who u r because of the ignorance of others,” followed by the words “courage” and “support.”

“We’ve got to get rid of the shame. That’s the main thing. And Jason’s going to help that. He’s going to help give people courage to come out,” said Billie Jean King, a member of the International Tennis Hall of Fame who confirmed she was gay after being outed in the early 1980s.

“I guarantee you he’s going to feel much lighter, much freer. The truth does set you free, there’s no question. It doesn’t mean it’s easy. But it sets you free,” King said in a telephone interview with The Associated Press.

The Wizards, whose season ended April 17, issued a statement from President Ernie Grunfeld: “We are extremely proud of Jason and support his decision to live his life proudly and openly. He has been a leader on and off the court and an outstanding teammate throughout his NBA career. Those qualities will continue to serve him both as a player and as a positive role model for others of all sexual orientation.”

Collins’ coach with the Celtics, Doc Rivers, drew a comparison between Monday’s announcement and Jackie Robinson’s role when he joined the Brooklyn Dodgers in 1947, breaking the color barrier in Major League Baseball.

“I am extremely happy and proud of Jason Collins. He’s a pro’s pro. He is the consummate professional and he is one of my favorite ‘team’ players I have ever coached,” Rivers said. “If you have learned anything from Jackie Robinson, it is that teammates are always the first to accept. It will be society who has to learn tolerance.”

Collins says he quietly made a statement for gay rights even while keeping his sexual orientation a secret. He wore No. 98 with the Celtics and Wizards — 1998 was year that Matthew Shepard, a gay college student in Wyoming, was killed, and the Trevor Project, a suicide prevention organization, was founded.

According to the General Social Survey, the public has grown increasingly accepting of gay relationships since the late 1980s. That survey found in 1987 that 76 percent of Americans thought sexual relations between adults of the same sex was morally wrong. That fell to 43 percent by 2012.

“I’m glad I’m coming out in 2013 rather than 2003. The climate has shifted; public opinion has shifted,” Collins writes. “And yet we still have so much farther to go. Everyone is terrified of the unknown, but most of us don’t want to return to a time when minorities were openly discriminated against.”

While some gay athletes have talked in the past about concerns that coming out would hurt their earning potential, 12-time Grand Slam singles champion King said she thinks Collins’ openness could have the opposite effect.

“I have a feeling he’s got a whole new career,” King said. “I have a feeling he’s going to make more in endorsements than he’s ever made in his life.”

Sports equipment maker Nike released a statement today saying: “We admire Jason’s courage and are proud that he is a Nike athlete. Nike believes in a level playing field where an athlete’s sexual orientation is not a consideration.”

Hours after his story appeared on the web, Collins wrote on Twitter: “All the support I have received today is truly inspirational. I knew that I was choosing the road less traveled but I’m not walking it alone.”

Momentum has been building toward this sort of announcement from a pro athlete in a top league in the United States. NFL players Brendan Ayanbadejo and Chris Kluwe were outspoken in support of state gay-marriage amendments during last year’s elections. Obama spoke about his support for gay marriage during his re-election campaign.

The topic made waves during Super Bowl week when one player, San Francisco 49ers cornerback Chris Culliver, said he wouldn’t welcome a gay member of his team. At the time, Ayanbadejo estimated that at least half of the NFL’s players would agree with what Culliver said, at least privately.

Scott Fujita, who recently retired after an 11-year NFL career, said: “I’m pleased to see such an overwhelmingly positive reaction to this news, because it just shows that we’re becoming more accepting every day. But more than anything else, I’m happy for Jason. I’m not a gay, closeted athlete, so I can’t pretend to know what that must have felt like for him. But I imagine this is freeing for him, and hopefully he’s encouraged by the millions of people who are voicing their support. … It’s not a reaction to some rumor and it’s not some unwanted outing. It’s his message, and it was delivered under his control and on his terms.”

NFL Commissioner Roger Goodell sent a memo to teams reiterating the league’s anti-discrimination policy about sexuality. It includes a section on questions teams cannot ask prospective draft picks and free agents. After the NFL combine in February, three players said officials posed questions about sexual orientation.

Earlier this month, the NHL and its players’ union partnered with an advocacy organization fighting homophobia in sports, and Commissioner Gary Bettman said the You Can Play Project underlines that “the official policy of the NHL is one of inclusion on the ice, in our locker rooms and in the stands.”

“I would say the NHL has been a force to kind of obviously embrace and encourage. … What (Collins) did, I think it’s definitely (good) for basketball, and the same for hockey, too. It’s going to be encouraging for more guys to step up and just be open about themselves,” Washington Capitals forward Joel Ward said.

Living in the nation’s capital last month while the U.S. Supreme Court heard arguments about same-sex marriage had an effect on Collins, who says “the strain of hiding my sexuality became almost unbearable” at that time.

“Less than three miles from my apartment, nine jurists argued about my happiness and my future. Here was my chance to be heard, and I couldn’t say a thing,” he writes. “I didn’t want to answer questions and draw attention to myself.”

After being a first-round draft pick in 2001, Collins has averaged 3.6 points and 3.8 rebounds for the New Jersey Nets, Memphis Grizzlies, Minnesota Timberwolves, Atlanta Hawks, Celtics and Wizards.

In his SI piece, he jokes self-effacingly about his journeyman career and a parlor game known as “Three Degrees of Jason Collins.”

“If you’re in the league, and I haven’t been your teammate, I surely have been one of your teammates’ teammates. Or one of your teammates’ teammates’ teammates,” he writes.

Never a star, he acknowledges, “I take charges and I foul — that’s been my forte. … I set picks with my 7-foot, 255-pound body to get guys like Jason Kidd, John Wall and Paul Pierce open. I sacrifice myself for other players.”

He continues: “I go against the gay stereotype, which is why I think a lot of players will be shocked: That guy is gay? But I’ve always been an aggressive player, even in high school. Am I so physical to prove that being gay doesn’t make you soft? Who knows? That’s something for a psychologist to unravel.”

As for what response other NBA players will have to his revelation, Collins writes: “The simple answer is, I have no idea.”

“Openness may not completely disarm prejudice, but it’s a good place to start. It all comes down to education. I’ll sit down with any player who’s uneasy about my coming out,” he says in his account, adding: “Still, if I’m up against an intolerant player, I’ll set a pretty hard pick on him. And then move on.”

Today, there was an outpouring of positive sentiments.

In texts to the AP, Wizards guard Garrett Temple wrote, “I was surprised. I didn’t know and I was right next to him in the locker room. It definitely took a lot of courage for him to come out. He was a great teammate,” and rookie Bradley Beal said: “I didn’t know about it! I don’t think anyone did! I am proud of his decision to come out and express the way he feels and I’m supportive of that!!”

Former teammate Jerry Stackhouse, now with the Brooklyn Nets, wrote in a text: “I hope Jason is received well by our NBA family. Jason is a friend and a former teammate that I’ve enjoyed many laughs and conversations with and his sexual orientation won’t change that with me. I’ve already reached out to him personally to show support and will encourage more guys to do the same.”

NBA Commissioner David Stern said in a statement: “Jason has been a widely respected player and teammate throughout his career and we are proud he has assumed the leadership mantle on this very important issue.”

While Collins is the first male athlete in a major North American professional league to come out while intending to keep playing, several have previously spoken after they retired about being gay, including the NBA’s John Amaechi, the NFL’s Esera Tuaolo and Major League Baseball’s Billy Bean.

“I think he is immensely brave. I think it’s a shame in this day and age he has to be immensely brave, but he is,” Amaechi told the AP. “He’s going to be a remarkable and eloquent spokesperson for what it is to be a decent, authentic human being — never mind just for gay people.”

Rick Welts, president and chief operating officer of the NBA’s Golden State Warriors, is openly gay.

“He probably knows what he signed up for. There’ll be a whole bunch more television reporters and cameras than he’s probably had in the past. … There had been a long of speculation about when, who, how. I think that speculation has been put to rest now,” Welts said, “and we’ll always remember that Jason Collins was the first man to do this.”

Collins says that if he remains in the NBA, he could face uncomfortable reactions from spectators.

“I don’t mind if they heckle me. I’ve been booed before. There have been times when I’ve wanted to boo myself. But a lot of ill feelings can be cured by winning,” he writes.

He adds: “I hope fans will respect me for raising my hand. And I hope teammates will remember that I’ve never been an in-your-face kind of guy. All you need to know is that I’m single. I see no need to delve into specifics.”

In February, former U.S. soccer national team player Robbie Rogers said he was gay — and retired at the same time. Rogers is just 25, and others have urged him to resume his career.

“I feel a movement coming,” he tweeted after word of Collins’ news broke.

Female athletes have found more acceptance in coming out; Brittney Griner, a top college basketball player now headed to the WNBA, caused few ripples when she said this month she is a lesbian. Tennis great Martina Navratilova, who came out decades ago, tweeted Monday that Collins is “a brave man.”

“1981 was the year for me — 2013 is the year for you,” her post added.

Sports leagues in Britain and elsewhere in Europe have been trying to combat anti-gay bias. But the taboo remains particularly strong in soccer, where there are no openly gay players in Europe’s top leagues. Homophobic chants are still heard at some games.

Soccer “is not going to change,” said Amaechi, who is English and now lives in Manchester. “If it wanted to change, it would change. It has the resources to do so. It doesn’t want to change.”

Justin Fashanu is the only significant British soccer player to have come out publicly, doing so in 1990. The former Nottingham Forest and Norwich City striker was found hanged in a London garage in 1998 at age 37. According to an inquest, Fashanu left a note saying that, because he was gay, he feared he wouldn’t get a fair trial in the United States on sexual assault charges. Maryland police were seeking him on charges that he sexually assaulted a 17-year-old boy.

Among other athletes outside the U.S. to come out was Gareth Thomas, a Welsh rugby star who attracted widespread media attention in 2009 when he announced he was gay. He continued playing until retirement in 2011.

Orlando Cruz of Puerto Rico came out in October as the first openly gay professional male boxer. Canadian swimmer Mark Tewksbury came out six years after winning a gold medal in the backstroke at the 1992 Barcelona Games. Four-time Olympic diving gold medalist Greg Louganis of the U.S. revealed he was gay in 1994, a year before announcing he was also HIV-positive. Former Olympic skiing gold medalist Anja Paerson of Sweden announced last year, after retiring, that she was in a long-term relationship with a woman.

White House spokesman Jay Carney called Collins’ decision courageous and said the administration views it as another example of progress and evolution in the U.S. as Americans grow more accepting of gay rights and same-sex marriage.

Former President Clinton said: “Jason’s announcement today is an important moment for professional sports and in the history of the LGBT community. It is also the straightforward statement of a good man who wants no more than what so many of us seek: to be able to be who we are; to do our work; to build families and to contribute to our communities. For so many members of the LGBT community, these simple goals remain elusive.”

Collins attended Stanford with Clinton’s daughter Chelsea and played in a Final Four while at the school. His twin brother, Jarron, was also a longtime NBA center who last played in the league in the 2010-11 season. Collins says he told his brother he was gay last summer.

“He was downright astounded. He never suspected. So much for twin telepathy,” Collins writes in SI. “But by dinner that night, he was full of brotherly love. For the first time in our lives, he wanted to step in and protect me.”

Advocacy organization GLAAD released a statement from Aaron McQuade, the head of its sports program.

“Courage’ and ‘inspiration’ are words that get thrown around a lot in sports, but Jason Collins has given both ideas a brand new context,” he said. “We hope that his future team will welcome him, and that fans of the NBA and sports in general will applaud him. We know that the NBA will proudly support him, and that countless young LGBT athletes now have a new hero.”

At Stanford, Collins was a college roommate of Rep. Joe Kennedy III, D-Mass. In his account, Collins writes that he realized he needed to go public when the congressman walked in Boston’s gay pride parade last year — and Collins decided he couldn’t join him.

“For as long as I’ve known Jason Collins he has been defined by three things: his passion for the sport he loves, his unwavering integrity, and the biggest heart you will ever find. Without question or hesitation, he gives everything he’s got to those of us lucky enough to be in his life. I’m proud to stand with him today and proud to call him a friend,” Kennedy said in a statement.

In Monday’s story, Collins writes that the Boston Marathon bombing on April 15 “reinforced the notion that I shouldn’t wait for the circumstances of my coming out to be perfect. Things can change in an instant, so why not live truthfully?”

And now, Collins says, he will be in Boston on June 8, marching alongside Kennedy at the city’s 2013 gay rights parade.

“Some people insist they’ve never met a gay person. But Three Degrees of Jason Collins dictates that no NBA player can claim that anymore. Pro basketball is a family. And pretty much every family I know has a brother, sister or cousin who’s gay,” Collins concludes. “In the brotherhood of the NBA, I just happen to be the one who’s out.”

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AP Sports Writers Joseph White, Nancy Armour, Larry Lage, Brian Mahoney, Antonio Gonzalez, Rachel Cohen, Paul Newberry, Jimmy Golen, Howard Ulman, Rob Harris, Steve Wilson, Richard Rosenblatt and Tom Withers, and Associated Press Writers Mary Clare Jalonick, Cara Rubinsky, Jennifer Agiesta and Josh Lederman contributed to this report.