Kei Nishikori produced some impressive tennis to beat Stan Wawrinka in a rematch of their US Open semi-final on Monday at Londons O2 Arena. World No 5 Nishikori lost their Flushing Meadows battle earlier this year and had lost four of his six meetings with Wawrinka going into their latest clash at the ATP World Tour Finals. Six months half price Upgrade to Sky Sports to watch Man Utd v Arsenal on Saturday and get the first six months half price But Nishikori, who made the semi-finals of the Tour Finals in 2014, found the speed of the court to his satisfaction to secure a 6-2 6-3 win in the John McEnroe group that also contains world No 1 Andy Murray and Marin Cilic. Shots of the matchNishikori was at full stretch, but somehow kept his racket head steady to power back an angled volley winner during a dominant opening set. Described by Sky Sports tennis analyst Mark Petchey as arguably the hardest shot in tennis to hit a winner off. Watch Nishikoris stunning backhand volley at full stretch Third-ranked Wawrinka wasnt to be outdone though and struck this flashy forehand winner using an open stance, big lunge with no forward movement to his body weight. It was all arm with little hip rotation. Thats what made him a three-time Grand Slam winner. Wawrinka pulled off this stunning forehand winner during his match against Nishikori Expert analysis He was so dominant and it was a little disappointing the way Wawrinka went away in that match. I wonder if that left knee is bothering him? Annabel Croft Nishikori was great and did everything right out there today and Stan The Man wasnt there today. It was a combination of greatness and a guy who was a little bit flat. Greg Rusedski The matchUS Open champion Wawrinka, wearing tape around his knee, felt intense accumulative pressure from Nishikori, who made the breakthrough at the fourth time of asking, with some trademark ball-striking from the baseline to take a 3-2 lead. Nishikori joined Sky Sports tennis analyst Leif Shiras at the SkyPad The Japanese star held serve before breaking for the second time by taking advantage of some inconsistent serving by Wawrinka.Nishikori served up 11 winners in 29 minutes of dominant tennis. Nishikoris impressive second serve return placement during a dominant opening set against Wawrinka Some jaw-dropping forehands, with length and pace kept Wawrinka at bay in the next and he soon moved ahead with a somewhat lucky break in the fifth game after his blocked return dropped tantalisingly over the incoming Swiss and found the baseline.Wawrinka opened the door in ninth game to hand Nishikori his first match point, which he took with aplomb, forcing his opponent into another unforced error - his 31st of the match - to seal victory in 67 minutes. Wawrinka v Nishikori: Match Stats Wawrinka Nishikori Aces 5 5 Double faults 3 1 First serve points won 62% 80% Second serve points won 38% 73% Break points saved 3/7 0/0 Total points won 41/101 60/101 Check our game-by-game coverage from all group matches at the ATP World Tour Finals in London - including Andy Murray - on skysports.com/tennis, our app for mobile devices and iPad and our Twitter account @skysportstennis.Upgrade to Sky Sports now to watch Man Utd v Arsenal this Saturday and get the first six months half price! Also See: As it happened... Now well see the real Novak Tour Finals: Panel predictions Murray: Faster court a benefit Luke Bolton Jersey . -- Playing time has been limited for Maxim Tissot this season, so the Montreal Impact defender made the most of his first scoring opportunity on Saturday. 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Just ask Sacramento Kings coach Dave Joerger, whos ready to make wholesale changes after the teams 4-9 start to the season.Ive seen enough, Joerger told reporters after the Kings 121-115 loss to the LA Clippers on Friday night. Were going to play small.That means moving DeMarcus Cousins, who had 38 points and 13 rebounds, to center and surrounding him with smaller players. Kosta Koufos, who started at center on Friday, did not play in the second half vs. the Clippers.DeMarcus is going to play center. I dont know who else will play with him, Joerger said. It just gives us more zip, more life, more experience. Thats not any detriment to anyone else or what theyve done.The Kings had trailed at halftime by 26 points.dddddddddddd He said the smaller lineup energized the team in the second half, and thats what hell try moving forward.Along with sliding Cousins to center, Joerger inserted point guard Darren Collison to play alongside Ty Lawson, and he moved Arron Afflalo to small forward and Rudy Gay to power forward.We have five skill guys then, Joerger said. You cant cheat, you cant roam, you have to play everybody. It gave us another dimension in the pick-and-roll, having two playmakers out there.Said Collison: Its easier to get in the paint when two bigs are not there. ' ' '