Dundee United have confirmed Ray McKinnon as their new manager on a three-year contract. McKinnon resigned his position as Raith Rovers manager on Tuesday and had been in negotiations to succeed Mixu Paatelainen, who was sacked last week.That came after Sky Sports News HQ reported on Monday that discussions were underway after Raith accepted the offer of compensation from United on Sunday. McKinnon in action for Dundee United during his first spell at the club McKinnon told the clubs website: This is a wonderful opportunity at a club that is close to my heart and I am looking forward to taking on the task of rebuilding the club and developing the talent required to get us where we should be.There are a lot of challenges ahead and it is important that we give ourselves every opportunity to succeed. We will work hard to build a team that the United fans can be proud of.An ex-United player, the 45-year-old Dundonian made 122 appearances for the Tangerines, scoring thirteen goals in two spells at the Club.United, who were relegated from the Scottish Premiership and docked three further points for fielding ineligible players, confirmed McKinnon will watch Saturdays game away to Kilmarnock from the stand. McKinnon salutes the Rovers fans after the play-off defeat at Easter Road McKinnon guided Rovers to an impressive fourth-place Championship finish before their promotion hopes ended following a 2-1 aggregate defeat to Hibernian in the play-off quarter-final.McKinnon added: I want to thank everyone at Raith Rovers.I really enjoyed my time there and I am grateful to them for being so understanding of my desire to become manager of Dundee United. Raith Rovers are a fabulous, proper club whom I wish all the best. Also See: Raith accept McKinnon offer McKinnon starts United talks United in talks for McKinnon McKinnon resigns from Raith Cheap Fake NMD . Messis 75th-minute goal answered some of the criticism the clubs all-time leading scorer had received for his lacklustre performances in the teams recent losses in the league, Champions League and Copa del Rey final. Adidas NMD Womens Cheap . PAUL, Minn. http://www.cheapnmdonline.com/wholesale-adidas-nmd-r2-china.html . But history aside, theyre still happy to participate in the Par 3 contest, traditionally held on the day prior to the first round of the Masters. Adidas NMD R1 Japan Black . Assistant coach Glen Gulutzan said Thursday that Edler, who played Tuesday in Nashville, is out indefinitely. Adidas NMD R1 Cheap .ca. Hi Kerry, Welcome back! Im sure you heard Peter Forsbergs comments last week regarding Canadian referees in the gold medal game. Seems to me that he was questioning the integrity and impartiality.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.dddddddddddd.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 ' ' '