KEY BISCAYNE, Fla. Wholesale Air Force 1 . -- Novak Djokovic benefited from an erroneous call and claimed he didnt 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 quarter-finals 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 been awarded the point because Djokovics 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 cant 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 didnt touch the net. Maybe the rule is that you are not allowed to pass on his side with the racket. Im 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. "Im not angry," he said. "It maybe had a slight bearing on that game, but I was still up a break in the second set." Nishikori will be playing in only his second ATP Masters 1000 semifinal, and his first in 2 1/2 years. "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." Federer was the runner-up to Djokovic at Indian Wells two weeks ago, and said hes pleased with his start to the year despite the latest loss. "I just couldnt find my rhythm on the serve today, which was surprising," Federer said. "Its a bit frustrating, but Kei did well to stay with me. He was more consistent in the second and third, and in the end its to his credit." Li Na became the first Chinese woman to reach the Key Biscayne semifinals when she beat Caroline Wozniacki 7-5, 7-5. Lis opponent Thursday night will be Dominika Cibulkova, who erased three match points in the second set -- one when a call was overturned via replay -- and beat Agnieszka Radwanska 3-6, 7-6 (5), 6-3. Six-time champion Serena Williams will play five-time runner-up Maria Sharapova in the other womens semifinal. Williams has beaten Sharapova 14 consecutive times. Murray won the Key Biscayne title in 2009 and 2013 but wasnt at his best against Djokovic. The Scotsman committed five double-faults and 32 unforced errors, including a flurry down the stretch. He took a 3-2 lead in the second set with his only service break, then double-faulted twice to give it right back. But it all might have been different if not for the call that made one point stand out from the other 125. Djokovic had won praise for his sportsmanship when he conceded a point following an erroneous call in his match Tuesday, but against good friend Murray, he left the verdict to the umpire. A sideline reporter told Murray that TV replays showed he was correct about the call, and during the ensuing changeover he questioned Steiner. "His racket was over the net," Murray said. "Its quite clear. You can see it on the replay." "I have to make a decision at the moment," Steiner replied. Any hard feelings on Murrays part didnt carry over after the match, when he shook hands with Djokovic and Steiner. "Its a hard one for the umpire to call," Murray said. "Just frustrating." And Djokovic said the call was the umpires to make. "Its not my fault," he said. "I mean, I was never lying on the court. I always try to be fair to whoever I play against." Air Force 1 Cheap Outlet . TSN was honoured with several awards, with Rod Smith and James Duthie sharing the win for Best Sports Host for SportsCentre and the NHL: Season On The Brink coverage, respectively. Air Force 1 Clearance Cheap . Tepesch, back from the minor leagues, earned his first major league victory in more than 10 months and the Rangers edged the Seattle Mariners 4-3 on Wednesday. http://www.airforce1clearance.com/ . -- Shanshan Feng was alone in her opinion about the pin positions in the Kraft Nabisco Championship.With NFL training camps underway, the league is abuzz with position battles, injury news and rookies making an immediate impact. Each day, TSN.ca provides the latest rumours, reports and speculation from around the NFL beat. Back in Business After missing close to a week of training camp, Carolina Panthers wide receiver Kelvin Benjamin returned to practice on Saturday. The 23-year-old suffered a bone bruise on his knee, which forced him to miss four days of camp. Benjamin, the Panthers first-round draft pick this year is expected to start immediately this season across from veteran wide out Jerricho Cotchery. No Shon? The Miami Dolphins may be without running back Knowshon Moreno for the entire preseason as he continues to recover from arthroscopic surgery. When asked by the Miami Herald if he would be able to appear in at least one preseason game in his first season with the Dolphins, Moreno made no promises. "I dont know. I dont know. I really dont even know. I just want to take each day one at a time. They have a schedule for me and theyre just going to tell me every day what I have to do, and I just go out there and do it." Moreno was initially scheduled to miss four to five weeks, however he is now into his sixth week of reccovery and remains on the physically unable to perform list. Cheap Air Force 1 China. Moreno was signed in the offseason by the Dolphins, after reaching the Super Bowl with the Denver Broncos in 2013. Moreno rushed for 1,038 yards and touchdowns in 16 games with the Dolphins last season. In his absence, Lamar Miller is taking added snaps as he competes for the starting tailback role. Not a Good Turn Buffalo Bills wide receiver Marquise Goodwin suffered a hamstring injury on Friday, putting his status for Sundays Hall of Fame game against the New York Giants. Goodwin caught 17 passes for 283 yards and three touchdowns in his rookie season with the Bills last year. He was drafted in the third round of the 2013 NFL Draft. The Bills currently have 12 wide receivers on their roster, but will likely only take five into the regular season. Starting Cyril? Rookie offensive lineman Cyril Richardson has been taking snaps with the Buffalo Bills first-team offence at right guard. Richardson was drafted in the fifth round of this years draft by the Bills after playing college football at Baylor. Richardson is competing with Chris Hairston and 2013 starter Kraig Urbik for the right guard position. The Bills allowed 48 sacks last season. 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