CLEVELAND >> Carson Palmer threw for four touchdowns — three in the second half — and 374 yards as the Arizona Cardinals rallied for a 34-20 win Sunday over the Cleveland Browns, who lost two defensive starters with concussions.

Palmer had two TD passes in the third quarter when the Cardinals (6-2) overcame a 20-10 halftime deficit. His third TD of the second half, a 6-yarder to Larry Fitzgerald, gave Arizona a 31-20 lead.

Michael Floyd had a 60-yard TD catch and tight end Troy Niklas had two short TD receptions as the Cardinals overcame four turnovers and won in Cleveland for the first time since 1985.

The Browns (2-6) lost their third straight, and cornerback Joe Haden and safety Donte Whitner sustained concussions.

Quarterback Josh McCown had three TD passes. The 36-year-old also played much of the second half in pain after re-injuring his right shoulder.