KEY BISCAYNE, Fla. (AP) — Novak Djokovic benefited from an erroneous call and claimed he didn't realize he had broken the rules. When Andy Murray walked to the net and challenged him about it, Djokovic responded with a shrug and a sheepish smile.
Murray lost the dispute, and the match. The pivotal ruling against the defending champion helped Djokovic win 7-5, 6-3 in the quarterfinals of the Sony Open.
Roger Federer was up a service break twice in the second set but lost to No. 20-seeded Kei Nishikori 3-6, 7-5, 6-4. Nishikori will play Djokovic on Friday.
The point that aggravated Murray occurred at the start of the 12th game, when he was serving at 5-6. Djokovic charged forward to volley a short ball and hit it for a winner.
Murray argued — and TV replays confirmed — he should have be awarded the point because Djokovic's racket was on the far side of the net when he hit the ball. Chair umpire Damian Steiner declined to change his call, and such rulings can't be appealed for video review.
Murray briefly discussed the matter with Djokovic.
"I went and asked Novak, and he told me he was over the net," Murray said.
"Look, it might be my mistake," Djokovic said. "I think I crossed the net with the racket. I didn't touch the net. Maybe the rule is that you are not allowed to pass on his side with the racket. I'm not sure. You tell me."
That is indeed the rule. Djokovic said that if he had understood it correctly, he would have conceded the point.
A flustered Murray committed unforced backhand errors on the next three points to lose the game and the set.
"Obviously, that distracted him mentally, and after that he gave the set away," Djokovic said.
Murray took a lead in the second set but lost the final four games and the last 12 points. Afterward, he downplayed the bad call.
"I'm not angry," he said. "It maybe had a slight bearing on that game, but I was still up a break in the second set."
Djokovic's next opponent, Nishikori, will be playing in only his second ATP Masters 1000 semifinal, and his first in 2½ years. He advanced by breaking Federer five times, including in the final game.
"I thought I really played well, especially in the third set," Nishikori said. "I was hitting balls deep and striking well. Everything was going well."
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