World No. 1 Jason Days place in the lucrative season-ending Tour Championship is in doubt after he withdrew with a back injury from the BMW Championship won by Dustin Johnson.Day tweaked his lower back when he bent down to put a tee in the ground on the ninth hole and decided to pull out of the event rather than risk further damage.Already well back off the lead, he now has a serious challenger for his place at the top of the world rankings as world No.2 Johnson powered home to win at Crooked Stick Golf Club by three shots.Johnson shot a final round five-under 67 to surge to 23 under for the tournament, winning for the third time this year to go with his US Open and WGC Bridgestone Invitational triumph.Englands Paul Casey finished runner-up for the second week running, closing with a 67 of his own to be 20 under, with American Roberto Castro (67) playing his way into the season finale by finishing third at 17 under.The results puts the American closer to Day in the world rankings ahead of the season ending Tour Championship, and sends him to the top of the season long FedExCup points list.Defending event champion Day has a history of back issues, withdrawing from the BMW Championship in 2014 with a similar complaint.He also battled a bad back at the 2015 Barclays and 2016 World Golf Championships Match Play with the same issue before fighting through the pain and winning.His place in Atlanta in two weeks is now in doubt where the winner of the season long FedExCup will claim a $US10million bonus.Hes all right, hes just got some back issues and is in a little bit of pain. Hes getting treatment right now. I dont think its anything that he hasnt dealt with before, Days manager Bud Martin said.The trainer is maybe thinking its the same type of thing that he dealt with I think at the Barclays and last year where he picked something up in his bus and it kind of got out of line.But just better safe than sorry. Instead of forcing it, we just decided that it was more prudent to kind of come in, get it worked on, and deal with it.Day dropped from second to fourth in the FedExCup standings which is of minimal consequence as those in the top five can guarantee the FedExCup with a win in the TOUR Championship.Well probably get a MRI just to double check. My gut is that hell be fine, Martin said.Hopefully, hell be ready for Atlanta, but the most important thing is the next 15 years, not the next 15 days.Meanwhile Adam Scott finished fourth for the third straight playoff event.A final round 71 left him 12 under, 11 shots off the win. He is now third in the season-long points list, giving him a chance to win it all in two weeks time.Hopefully Im saving my best for last, that would be a great way to finish the year, Scott said.And starting in third, that would mean I would win the FedExCup. So thats an exciting spot for me to be in and hopefully I can take advantage of it.Marc Leishman (-1) and Aaron Baddeley (+4) have ended their seasons. Cheap Atlanta Falcons Jerseys . On Saturday night, the normally free throw-challenged centre did just that. Howard scored 18 of his 25 points in the fourth quarter, including 13 of 19 free throws in a 2 1/2-minute stretch, and the Houston Rockets beat the Denver Nuggets 122-111. Cheap Washington Redskins Jerseys . And when it opened, every player was at his stall. Thats a sure sign that a team is in a slump and is searching for answers. "Its embarrassing to be at home and play the way we did," said defenceman Josh Gorges. http://www.wholesalejerseysnfloutlet.com/cheap-san-francisco-49ers-jerseys/ . Rinne played two periods in his first game since left hip surgery in early May. Gabriel Bourque scored 3:07 into the second period and Austin Watson tallied 5:15 later for Nashville. Cheap Philadelphia Eagles Jerseys . During the athletes parade, the 23-strong Ukrainian team was represented by a lone flagbearer in an apparent protest at the presence of Russian troops in Ukraines Crimean peninsula. Cheap Detroit Lions Jerseys . During the athletes parade, the 23-strong Ukrainian team was represented by a lone flagbearer in an apparent protest at the presence of Russian troops in Ukraines Crimean peninsula.Two-time champion Juan Martin del Potro went down swinging in a 7-5 6-4 quarter-final loss to Kei Nishikori at the Swiss Indoors on Friday. Despite ending the match with 14 aces, the Argentine went down in just under two hours which wrapped up the ATP season for him. He will skip next weeks Paris Masters to return home to train for the Davis Cup final against Croatia.Nishikori, who lost out to Roger Federer in the 2011 title match, will be bidding to reach his second Basel final when he takes on Gilles Muller, a 6-7 (4-7) 6-4 7-6 (7-3) winner over Argentine Federico Delbonis. Wild card Del Potro, whose ranking of 42 is 1,000 places better than in February when he returned after almost a year of wrist problems and surgery, was taking on third seed Nishikori in the first meeting since the London Olympics four years ago. Watch NOW TV Watch Sky Sports for just ￡6.99. No contract. Nishikori dealt out only seven aces, but fired his last one to earn a pair of match points - one was enough as he put away a volley winner at the net.This was my best match of the week, said Nishikori It was a tough match. I had so many chances, so many break points that I could not convert.I played good tactics today, everything was working well. Del Potro will now prepare for the Davis Cup final against Croatia Del Potro was pleased with his week which came after he lifted his first title in nearly three years at Stockholm last Sunday.ddddddddddddIve been trying to fix my problems for the past two years, Del Porto said. And I didnt expect to win a title at this moment in my career. Its still a motivation for looking forward to the future. Wawrinka suffered a shock exit to Mischa Zverev Top seed and US Open champion Stan Wawrinka slumped to a shock 6-2 5-7 6-1 defeat to German qualifier Mischa Zverev.Zverev, 29, and ranked 72 in the world, will face ATP World Tour Finals hopeful Marin Cilic who beat Spains Marcel Granollers 6-3 6-3.Wawrinka was broken for 2-5 in the first set, got the tie back level by winning the second before going down a double break in the decider on his way to defeat in just under two hours.Check our game-by-game updates from Andy Murrays semi-final match against David Ferrer at the Erste Bank Open in Vienna on skysports.com/tennis, our app for mobile devices and iPad and our Twitter account @skysportstennis this Saturday or catch the action from Vienna, live on Sky Sports 4 HD from 1pm & Basel on the Red Button. 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