A win that proved he has reached a different dimension, a testament to his growth. Kei Nishikoris five-set victory over Andy Murray in the quarter-finals of this years US Open was one of the best of his career. Probably one of his biggest since reaching the final in New York in 2014.And it was impressive, coming over four hours and from two sets to one down. But was it, as Japanese tennis veteran Kimiko Date-Krumm suggested, a victory that proved the 26-year-old Nishikori has reached a different dimension? For many the jury is still out.Not that Nishikori has not been successful already. He has won 11 career titles, an Olympic bronze medal, reached the final of the US Open, made three Masters finals, and hit as high as No 4 in the world. But there has been a common theme that seems to have prevented any further progress: fatigue or injury.In the 2014 US Open final he was beaten in straight sets by Marin Cilic, saying afterwards that his body was heavy. After losing in the semi-finals in New York to Stan Wawrinka this year, he said: I was definitely tired, especially in the end. At Wimbledon he did not look fit from the outset against Cilic and eventually retired at 6-1 5-1 down. Nishikori beat Andy Murray at this years US Open There is no doubting Nishikoris talents, but his progression to the very top has been hampered by consistent injury issues. There is also a question of whether he can physically go the distance throughout the two weeks of a Grand Slam.In 2014, one of his coaches, Dante Bottini, said that part of Nishikoris problem with injuries was mental and he didnt really know how to deal with pain and injury.It was a clearly a priority for Nishikori and his team at the time.If I have one goal for next year that would be for Kei to go out there and play 95 percent of the year healthy, said Nishikoris coach Michael Chang in December 2014. To go through the year without having an injury or something happen that takes you out for two to three weeks at a time would be a huge accomplishment and that alone would take his tennis to the next level. Mark Petchey looks ahead to the ATP World Tour Finals Chang also said that he felt Nishikori had an opportunity to win a major on any surface.That challenge, though, has not materialised. While he has performed well at the US Open, he has never made it beyond the fourth round at Wimbledon, has only made one quarter-final at Roland Garros and never progressed beyond the last eight in Melbourne.So what does Nishikori need to do to make the next step up?Perhaps his injuries have just been bad luck. Perhaps he need to lighten his load in 2017 and the years ahead. One aspect that could really help him win a Slam would be his serve Michael Chang I have been playing a lot of matches this year, he said last week. Maybe thats why I have been hurting these couple months, not feeling 100 percent yet.At the moment his body seems as though sometimes it is his toughest opponent.But because of his style of play that might not change. Nishikori does not have a huge serve - of the eight players in London he has the fewest aces in 2016 - and rather he excels with his court coverage and brilliant backhand.But grinding out so many points appears to be taking its toll on the world No 5.Chang admitted earlier this year that one aspect that could really help him win a Slam would be his serve. Michael Chang started working with Nishikori ahead of the 2014 season He added: Its improved a lot over the past couple of years but it still needs to get better and more consistent.Nishikori mixed it up at the US Open by serving and volleying, using the tactic to great effect against Murray in the quarter-finals.Sky Sports pundit Mark Petchey said: Hes definitely trying to protect his serve a bit better this year against obviously great returners.But will that be enough for Nishikori to consistently compete with the best?Ahead of the ATP World Tour finals, he acknowledged: I have to do a little better in the big tournaments, especially the Grand Slams and all the ATP World Tour Masters 1000s.Physically, I got much stronger the last couple of years. I try to work hard every day, try to be confident in every match and enjoy my tennis. Its good motivation.Is motivation enough to see the Japanese make the next step? That remains to be seen.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. Also See: Panel predictions Stan the danger man Murrays year in numbers Tour Finals at The O2 Rays Jerseys China . With the results, North America claimed 2.5 of the three available points, opening up a 17.5-12.5 lead in the overall standings. A total of 60 points are available, meaning the first team to 30.5 points will win the Continental Cup. Austin Pruitt Rays Jersey . Formula One boss Bernie Ecclestone dismissed Tuesdays massive anti-government protest in Manama as "a lot of kids having a go at the police." "I dont think its anything serious at all," Ecclestone was quoted as saying in The Guardian newspaper on Wednesday. https://www.cheapraysonline.com/526i-jes...ersey-rays.html. Called on from the college ranks to replace Andy Reid, Kelly implemented a whole new atmosphere in the City of Brotherly Love and now has the Eagles in the playoffs for the first time since 2010. Jalen Beeks Rays Jersey . - After three days of light, make that very light, workouts, Team Irvin and Team Carter are ready for tonights Pro Bowl. Tommy Pham Jersey . Tensions rose in the first period when Penguins defenceman Brooks Orpik hit Bruins forward Loui Eriksson with what appeared to be a clean hit.FORT WORTH, Texas -- With a significant lead and the laps winding down, Joey Logano kept thinking about getting to the white flag. Less than a half-lap from finally seeing that wave at Texas on Monday, a caution changed everything -- though only for a few extra laps. "My heart dropped. I got really angry instantly," said Logano, who was in the third turn on the 333rd of 334 scheduled laps when the caution happened. "Youve got to go out there and win at that point, figure out how to do it." Logano still got the victory, just in a more exciting fashion. He passed Jeff Gordon on the last of 340 laps after a green-white-checkered finish in the Sprint Cup series version of overtime. When Kurt Busch slammed into the wall, spewing debris on the track, Loganos 2.2-second lead over teammate Brad Keselowski was gone and he didnt get to take the white flag that would have guaranteed no extra laps. On the ensuing pit stop, Gordon took only two tires and exited first. Both Team Penske drivers took four tires, and Logano got a splash of fuel. But Keselowski missed a chance to become this seasons first two-time winner when he was penalized for speeding on pit road and finished 15th. "I was just trying to get a little too much on pit road," Keselowski said. "Were in it for wins. Were not in it for second. Second or 15th is the same for us." The 23-year-old Logano got his fourth career victory, and Jeff Gordon took over the series point lead from Dale Earnhardt Jr., who had an early crash. "He crossed over and got into the back of me pretty good," Gordon said of the last lap with Logano. "At that point, I was just thinking, I just want to finish. Looked out my mirror, those guys were racing hard behind me. A great, great second-place finish for me." Here are five other things that happened in the rain-delayed race at Texas: 7 WINNERS FOR 7 RACES: Logano became the seventh different winner in as many Sprint Cup races this season, when new rules for the championship Chase put an increased emphasis on winning. Team Penske joined Stewart-Haas Racing as the only teams with multiple winners this season. JUNIORS MISTAKE: Earnhardt finished last for the first time in seven seasons with an early mistake that also made aa long day for Hendrick teammate Jimmie Johnson.dddddddddddd Only 13 laps into the race, Earnhardt drove his No. 88 Chevrolet halfway into the rain-saturated infield grass before it shot across the track and slammed into the wall in a fiery crash. Debris and mud from that damaged Johnsons windshield and front left side. "It was kind of surreal what happened," said Johnson, who later had a right rear tire issue and finished 25th. Earnhardt tweeted: "That wasnt fun. Sorry 2 the fans of the 88 team. Feel bad for my guys and the 48 team also. Made a mistake there that was costly for every1." The last time Earnhardt finished 43rd was the 2007 fall race at Phoenix -- a span of 222 races. HARVICKS BLOWN ENGINE: Kevin Harvick has finished 36th or worse in four of the five races since winning at Phoenix the second week of the season. He started third at Texas, but completed only 28 laps because of a blown engine right after a restart and wound up 42nd. "Its frustrating. I dont know what else I can say," Harvick said. "I didnt get any indication that anything was going wrong." FLAPPIN IN THE WIND: The race started with 10 caution laps to make sure the 1 1/2-mile high-banked track was ready for racing after being postponed Sunday by rain. There were jet dryers on the track during those laps, and the high-pressure air from those affected the hood and roof flaps on several cars. Keselowski made four trips down pit road after his hood popped up and his crew made repairs. "It was one of those freak deals," Keselowski said. Gordon said one of the jet dryers "about blew all of us over." NASCAR put all the cars in their original starting spots. "Im not sure whats more odd, if that happened or NASCAR allowed those guys to repair that thing," Gordon said. "Had a piece of concrete fly through my car once at Martinsville. I dont ever remember them letting me repair the car." STEWART LEADING: Tony Stewart was the polesitter and led laps for the first time season, and not only the first 10 laps during that competition caution to start the race. He 74 of the first 76 laps, and went on to a 10th-place finish. Those also made him the career leader for laps led at Texas Motor Speedway with 801. ' ' '