Parker broke the fourth metacarpal -- the bone between the bottom knuckle and the wrist -- near the end of the first half and did not return to the game. The injury apparently occurred during a scramble for the ball.
"I knew it was a scrum," teammate Tim Duncan said. "... He said he reached for the ball, and hit the ball or hit a body or a hand or something."
Parker did not comment before leaving the locker room after the Spurs' 102-92 win over Memphis. He had eight points and four assists before the injury.
The Spurs confirmed the broken bone, but could not say how long Parker, the team's second-leading scorer at 16.6 points a game, would miss. The team will evaluate the injury later.
Spurs coach Gregg Popovich was more direct about the nature of his point guard's loss.
"He's got a broken hand. He'll be out six weeks," the Spurs coach said. "He did it in the first half when he dove on the floor."