PALM BEACH GARDENS, Fla. -- Russell Henley made good on his second chance at the 18th hole Sunday and won the Honda Classic after a wild day that began with Tiger Woods walking off the course with a back injury and ended with a four-man playoff. The closing hour at PGA National was a series of blunders by the contenders -- and even the winner. Henley was in a three-way tie for the lead, 40 yards left of the flag on the par-5 18th in regulation, when he chunked a chip so badly that it only got halfway to the hole. He had to two-putt for par, and then watched as Rory McIlroy nearly made a great escape from an otherwise bad afternoon. McIlroy, who lost a two-shot lead, hit a 5-wood from 236 yards to just inside 12 feet for an eagle and the win. It narrowly slid by on the right. In the playoff, Henley was the only player to reach the 549-yard hole in two, and he two-putted from about 40 feet for birdie. Ryan Palmer missed a 10-foot birdie putt. McIlroy went from the back bunker to the front collar and had to scramble for par, and Russell Knox laid up and missed a 20-foot birdie attempt. "This isnt going to sink in for a while," Henley said. Thousands of fans who spent hours in the warmth and wind of south Florida surely felt the same way. David Hearn (67) of Brantford, Ont., finished 6-under par to tie with American Will MacKenzie for sixth. Woods abruptly quit after 13 holes and was driven straight to his car. He later said he had lower back pain and spasms, and was unsure if he could play at Doral next week. And then came all the mistakes by four guys trying to win. Palmer missed a 5-foot par in regulation that would have won it. He closed with a 69, the only player in the last six groups to break par. Knox needed a birdie on the last hole, but he went from the fairway bunker to the rough, well over the green and then calmly made a par putt just inside 10 feet for a 71 to get in the playoff. They all finished at 8-under 272. Canadas David Hearn fired a final round 67 to finish two shots off the pace. The conditions were tough. The play was so underwhelming that McIlroy said that if he had won, "It would have felt undeserved in a way." He wont know that feeling. Instead, the 24-year-old from Northern Ireland closed with a 74. It was his second straight tournament in stroke play that he played in the final group and shot 74. He tied for ninth in the Dubai Desert Classic. His undoing came on the 16th, when McIlroy missed on a 6-iron from the bunker and went into the water, making double bogey. He fell out of the lead for the first time with a bogey from the bunker on the 17th. What should ease the pain was his finish -- a 5-wood he couldnt afford to miss that dropped from the sky to 12 feet left of the hole. "I was fortunate I was in the playoff," McIlroy said. "Seventy-four wasnt good enough to get the job done. To go out with a two-shot lead, you have to play well enough to win the thing. If I had won today, I would have counted myself as lucky. Ill pick myself up, get back it, try to get back at it at Doral and try to get the job done." Henley, who closed with a 72, won for the second time and qualified for the Masters. He also moves into the top 50 in the world ranking, making him eligible for the Cadillac Championship next week at Doral. It was the first playoff at PGA National since 2007, which also featured four players. McIlroy was at 13 under after a birdie on the fifth hole and appeared to be on his way, even after twice making bogey from the bunker to close out the front nine. PGA National was tougher than ever after a weekend of sunshine, and the stiff breeze in south Florida. The average score was 71.8, two shots harder than the third round. The contenders made it look like a beast. Henley tied for the lead by chipping in for birdie on the 14th, only to deposit his tee shot on the par-3 15th into the water for double bogey. Palmer missed a 6-foot birdie putt on the 14th hole, which wasnt nearly as damaging as the par putts he missed from 8 feet on the 16th and 5 feet on the 18th. Knox fell out of a brief share of the lead when he tried to play from the right rough on the 14th and had his shot carom into the water for a double bogey. At least they were still around. Woods was just a guy in a red shirt at PGA National when he shook hands with Luke Guthrie, his playing partner, and told him he was done. "Too early to tell," Woods said in a statement about playing next week at Doral. "Ill get treatment every day to try to calm it down. Just dont know yet. Wait until Thursday and see how it feels." It was the second straight year that the worlds No. 1 player walked out on the Honda Classic. 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Perhaps as important, shes sending a message to 17-year-old gold medal favourite Sara Takanashi of Japan. Iraschko-Stolz relegated Takanashi, who has 10 World Cup victories this season, to second place in two of three training jumps Saturday.OKLAHOMA CITY -- The Oklahoma City Thunder had been struggling on their own court, losing two straight and three out of their last four at home. Kevin Durant made sure that trend didnt continue Sunday night. Durant overcame a slow start to finish with 21 points, seven rebounds and eight assists, Reggie Jackson scored a career-high 27 points, and the Thunder rolled to a 119-96 win over the Boston Celtics. Serge Ibaka added 17 points and 11 rebounds for Oklahoma City, which had struggled at home after starting the season 13-0 at Chesapeake Energy Arena. The Thunder (27-7) have the best record in the Western Conference. Oklahoma City is 4-2 since All-Star point guard Russell Westbrook had arthroscopic knee surgery on Dec. 27. A day after the Thunder narrowly avoided a three-game losing streak -- rallying from a 13-point fourth-quarter deficit to win at Minnesota behind Durants season-high 48-point effort -- they seized control early against the Celtics, going on a 10-0 run in the first quarter and never trailing again. "We just want to come in here and focus every time, especially after an emotional win last night," Durant said. "On the back-to-back, it might have been easy for us to relax, but I think we did a good job of playing hard." Oklahoma City coach Scott Brooks said the emphasis wasnt so much on winning at home, but instead eliminating the in-game lapses that led to the Thunders recent home losses to Toronto, Portland and Brooklyn. "Its just important that we just play a 48-minute game," Brooks said. "I thought we had good moments on the games that we lost, but it wasnt consistent throughout the game and the other teams got hot down the stretch and we couldnt stop it. "But we didnt go into the game and say, Guys, weve got to win tonight because weve lost three out of our last four at home. We went into the game, Guys, we want to keep playing our style of basketball." Jeff Green and Avery Bradley scored 19 points apiece for Boston, which has lost four straight games and seven of its last eight. Oklahoma City matched its season high for points in a half and led 66-56 at the break. The Thunder scored the first six points of the second half and the Celtics came no closer than 11 the rest of the way. "I thought our ball movement in the first half was really good," Boston coach Brad Stevens said. "That dried up in the second, and we didnt help each other on defence very often. One of the things wweve got to do as a group is when things dont go well, weve got to collect ourselves quicker and make things go in our favour again.dddddddddddd When things are going well, were not bad, but when things dont go well, we havent responded well lately." Durant didnt record his first field goal until 5 1/2 minutes into the second quarter, but still had 17 points by halftime thanks to 9-of-10 free throw shooting. He sat out the fourth quarter with the game in hand. Jackson hit six of his first seven shots and was 3 of 3 from 3-point range while scoring 19 in the first half. He surpassed his previous career high of 23 points with 2:57 left in the third quarter, taking a pass from Durant and rising for a one-handed dunk. Jackson, who finished 9 of 12 from the field, said he doesnt feel extra pressure while subbing in the Thunders starting lineup for Westbrook. "Pressure bursts pipes or makes diamonds," Jackson said. "Im cool with it. I put a lot on myself and I expect big things from myself. Im just happy to have a pretty good game tonight and most importantly come out with another win." Moments after Jacksons dunk, Ibaka followed with another slam to put Oklahoma City ahead 89-68. "In that third quarter, they went on that run and we had no answer," Green said. "We came a little bit too attached to our man and let them get easy layups." Jordan Crawford scored 17 points and Kris Humphries added 14 for the Celtics. Jeremy Lamb scored 13 points and Kendrick Perkins ---playing against his former team ---added a season-high 12 points to go with six rebounds for the Thunder. NOTES: Westbrook spoke to the media before the game for the first time since his most recent arthroscopic knee surgery and says theres "never a doubt" that he wont be able to return to form. Hes already off crutches and is shooting free throws, but says he doesnt know when hell be able to return to the lineup. The team has said hell be out through the All-Star break. . Before the game, Green -- who began his career with the Thunder franchise before being traded to the Celtics -- went over to the Oklahoma City bench to greet some of his former teammates. . Durant was called for a technical foul 71 seconds into the game for complaining about officiating. . Former Thunder coach P.J. Carlesimo, fired by the team after a 1-12 start in the franchises first season in Oklahoma City (2008-09), was a colour commentator on the Celtics television crew. ' ' '