KEY BISCAYNE, Fla. -- Novak Djokovic advanced without hitting a ball for the second time at the Sony Open, and now hes in the final. Djokovic received his latest walkover Friday when Kei Nishikori withdrew less than two hours before their semifinal because of a left groin injury. "I tried to warm up and I couldnt move" Nishikori said. "With anybody on the other side, I dont think I could win today." The No. 2-ranked Djokovic also got a walkover in the third round and has played only six sets in the tournament. Hell try for his fourth Key Biscayne title Sunday against the winner of Friday nights match between No. 1 Rafael Nadal and No. 7 Tomas Berdych. No. 1 Serena Williams will try for her seventh Key Biscayne title when she plays No. 2 Li Na on Saturday. Former No. 1 Martina Hingis advanced to her first doubles final since 2007 when she and Sabine Lisicki beat Cara Black and Sania Mirza 6-3, 6-4. Nishikori said his groin has bothered him for more than a month, and he retired during a match in Delray Beach last month. This week he won a won a three-set match against David Ferrer, saving four match points, and then beat Roger Federer in a three-setter Wednesday night. The No. 21-ranked Nishikori said he wont need surgery, but hes unsure how long hell be sidelined and will fly home to Japan to see a doctor. His next scheduled match is in Davis Cup for Japan against the Czech Republic in Toyko on April 4. Nishikori has retired or withdrawn 14 times in his career, including three times in Grand Slam events. He was hoping to reach his first ATP Masters 1000 final. "It was going to be a great challenge for me today," Nishikori said. "Hopefully I can play another time." A Key Biscayne mens semifinal was also cancelled in 2012 when Nadal withdrew because of a knee injury, giving Andy Murray a walkover. Djokovic will try to complete a March sweep Sunday. He won the Indian Wells title two weeks ago, when he beat Federer in the final. Regardless of results the rest of the week, Nadal will remain No. 1 and Djokovic No. 2 next week. Donte Jackson Jersey . -- Jonas Hiller is cautiously confident he has kicked his vertigo. Marquis Haynes Jersey . Traditional contenders Brazil, Greece and Turkey drew the other three spots to complete the 24-team field for this summers tournament in Spain, basketball governing body FIBA announced Saturday at its meeting in Barcelona. http://www.officialcarolinapanthersfootball.com/. While plenty of statistics illustrate Torontos turnaround in the second year of manager Ryan Nelsens tenure, stopping goals is not one of them. Luke Kuechly Jersey .Best moustache: How can we not give this to Lanny McDonald? Check out the duster for yourself. Julius Peppers Jersey . Ortiz hit a pair of two-run homers, including his 400th shot in a Red Sox uniform, and drove in a career high-tying six runs to power Boston past the Houston Astros 10-7 on Saturday night.Got a question on rule clarification, comments on rule enforcements or some memorable NHL stories? Kerry wants to answer your emails at cmonref@tsn.ca! Hi Kerry, In Tuesdays game between the Canucks and the Islanders, Zack Kassian scored a goal that was disallowed as it was deemed goaltender interference. The two referees had a meeting and they came back with no goal. Clearly it was not goalie interference and the replay clearly showed it wasnt. My question is: is the play reviewable or not? I think it is. Gary Nelless -- Gary: I beg to differ with you — goaltender interference was CLEARLY committed when Zack Kassian bumped his Canuck teammate Mike Santorelli into (and onto) Evgeni Nabokov in the blue paint before depositing the puck past the felled Islander goalie. Goalie interference was so obvious on this play it should have been a no-brainer for the referee, even from his position deep in the corner, to have immediately waved the goal off. As you watch this play keep in mind the wording of rule 69.3 (If an attacking player initiates contact with a goalkeeper, incidental or otherwise, while the goalkeeper is in his goal crease, and a goal is scored, the goal will be disallowed.) At the present time Rule 69—Interference on the Goalkeeper is not reviewable. The fact that the Referee did signal a good goal by pointing at the net resulted in a check and balance procedure that followed to quickly and correctly overturn the initial call. A conference between the Officials is required when contact/interference with the goalie has taken place or is suspected to have occurred by at least one member of the crew. On this playy at least one (but most likely all) of the other Officials witnessed the interference on Nabokov and a conference was initiated to report their version of the play to the Referee that was allowing the goal.dddddddddddd After a very brief consultation between the four officials an announcement was quickly made to disallow the goal based on incidental contact with the goalkeeper. The contact was truly incidental in nature and no penalty was deserved other than the goal being disallowed. The procedure was followed to the letter and rendered the correct decision. In this case it was an easy call to make from any of the sightlines the crew had (save and except for one perhaps). Very seldom are they this clear cut as multiple players crash the net or when a defensive player initiates contact that propels an attacker into the goal crease. It is without a doubt the most difficult call for a referee and his colleagues to get right. For these reasons I have consistently stated that the Referees on the ice should personally have the advantage of reviewing the play (video review) from a monitor placed at ice level in a secured position. Refs are paid to make this call on the ice so allow them every advantage to ultimately make it correctly. Only if they are allowed to review the play will they have the same opportunity that the rest of us have to determine if and how goalkeeper interference took place. Games are won and lost with the scoring of dirty goals. This will continue, even with the checks and balance procedure in place, until the Referees are allowed to utilize video review in this specialized situation. Its a no-brainer! 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