Playing his first match in Hawaii as a pro, Kei Nishikori looked right at home.

The Japanese tennis star gave a supportive Blaisdell Arena crowd an hour of efficient and entertaining tennis in a 6-1, 6-2 win over Christian Harrison in Saturday’s Hawaii Open semifinals.

“It felt almost perfect,” Nishikori said. “I played good tennis today and it was a good crowd and it was really fun to play.”

Nishikori said he played Harrison in a practice match earlier in the week and “he was beating me pretty bad that day.”

This time, the world’s ninth-ranked player and tournament headliner gave up just seven points while powering through the first five games of the match in 21 minutes. Harrison raised his fist in triumph when he was finally able to hold serve, and Nishikori closed out the set four minutes later with his second ace of the game.

“I think I served well, in the forehand I think I had many winners and I was very happy with my forehand,” Nishikori said.

He added some flare late with a leaping between-the-legs shot on his first attempt at match point, but Harrison covered it with a nifty shot of his own to extend the match another serve and draw appreciative applause. Nishikori ended the match moments later and will face a another powerful serve today when he meets No. 18 Milos Raonic in today’s finale.

Raonic, who reached No. 3 in the world in 2016, held off Ryan Harrison, Christian’s older brother, 6-3, 6-4 in Saturday’s first men’s semifinal.

“He’s a great server, good forehand, very aggressive player and its always a good challenge playing against Milos,” Nishikori said.

“It’s good to have matches like this against top players. He’s a top-10 player and is great to have a preparation match before (opening the season in Australia).”

In today’s 11 a.m. women’s final, Elise Mertens, the highest-ranked player in the draw at No. 12 in the world, will face Eugenie Bouchard, who advanced with a win over former world No. 1 Garbine Muguruza.

“(Mertens is) a really good player. I lost to her this year. She has a lot of power, so I want to try to counter that and then take control when I can,” said Bouchard, who has spent much of her off-court time hanging out with close friend and island tour guide Michelle Wie.

Mertens, coming off a season highlighted by three wins on the WTA Tour, cruised past Christina McHale 6-2, 6-1.

Bouchard is the only finalist who played in Friday’s opening round, a win over CoCo Vandeweghe, and maintained her momentum with a 7-5, 6-1 win over Muguruza.

Bouchard, a 2014 Wimbledon finalist, broke Muguruza’s serve to claim the first set, then took control of the second from the service line.

She fired four of her six aces in the second set to breeze past the two-time grand slam champion.

“I had a couple of double faults in the first set, and I was pretty disappointed because my rhythm on my serve has been feeling good recently. So I was like what’s going on?’ ” Bouchard said. “So finally I got my serve together. I was actually more relaxed.”