LOUISVILLE, Ky. -- Defending champion Jason Dufner, suffering from a neck injury and struggling just to swing a golf club, pulled out of the PGA Championship just past the midway point of the opening round. After making a triple-bogey 8 on the 10th hole, he shk hands with playing partners Y.E. Yang and Keegan Bradley, a gd friend, and returned to the locker rm. "Theres no point to be out there hacking it around," he said before climbing into a courtesy car alongside wife Amanda and driving away from Valhalla Golf Club. "Its just pointless." Dufner ranked eighth among players battling for a spot on the U.S. Ryder Cup team. Had he held on -- qualifying ends this week -- Dufner would have been guaranteed a spot. He previously said hed be willing to skip the FedEx Cup playoffs to be healthy for the Sept. 26-28 matches in Scotland. But he said the Ryder Cup was a "secondary" concern right now. Asked when he might return to golf, Dufner lked disconsolate. "It could be next month, next year, 2016," he began, "but not until Im healthy." Dufner has been coping with two bulging disks in his neck since the Masters in April. He has tried to play through the pain this season, and had an injection before playing in the Bridgestone Invitational last week. But he said the worsening pain, coupled with "fatigue, tightness in the shoulders and a dead arm" finally convinced him to walk off the golf course. "It gets progressively worse. You lose strength, speed ..." Dufner said his voice trailing off. He said he couldnt even be sure at the moment what course of treatment to pursue to deal with the injury. "Ive tried ice, exercise, injections, pills. You name it, Ive done it all in the past month. The only thing I havent done," Dufner said, "is rest it." A reporter asked whether having won the first major of his career at Oak Hill in 2013 made this blow easier to absorb, Dufner just shk his head. "Last year was last year," he said. 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Scott reached the major leagues with Houston in 2005 and hit 23 homers or more for Baltimore each year from 2008-10. CHICAGO -- First, it was Jonathan Toews on a power play, and then Patrick Sharp got lse on a breakaway. Andrew Shaw tipped one home, and it was all over. One dazzling stretch for the Chicago Blackhawks put an end to their tight first-round series against the St. Louis Blues. Duncan Keith had a goal and three assists, and the Blackhawks used a four-goal third period to finish off the Blues with a 5-1 victory in Game 6 on Sunday. "It feels gd to contribute in a big game," Keith said, "and I think just the main thing for me is just being able to move on and get a couple days to relax and just regroup and focus on the next round." Chicago won four in a row after a slow start in St. Louis. The defending Stanley Cup champions will play the winner of the Minnesota-Colorado series in the Western Conference semifinals. The Avalanche lead the Wild 3-2 heading into Game 6 in Minnesota on Monday night. Toews, Sharp and Shaw scored in the first 7 1/2 minutes of the third and Keith closed out the scoring as the Blackhawks improved to 14-2 in home playoff games over the past two seasons. Bryan Bickell scored in the first and Corey Crawford made 35 saves, keeping Chicago in a tie game when St. Louis controlled the second period. "They were dominating the first 40 minutes here and we came back with maybe the best period of the year," coach Joel Quenneville said. T.J. Oshie scored for the Blues, who outshot the Blackhawks 36-27. Ryan Miller finished with 22 saves. St. Louis went 0 for 6 in 10 minutes of power-play time over the first two periods, wasting a chance to take the lead. The Blues went 2 for 29 with the man advantage for the series. "I think both the PK and (Crawford) won the game and the series ultimately," Quenneville said. "I think that was the big factor in us getting through." The Blackhawks also struggled on the power play, but they scored when it mattered most. With Jay Bouwmeester in the box for tripping, Keith made a nice stop to keep the puck in the St. Louis zone, and then sent a pass over to Toews. The captain beat Miller over his right shoulder for a 2-1 lead just 44 seconds into the third. It was Toews third game-winning goal of the series. He also scored on a breakaway in overtime of Friday nights 3-2 win. Toews 23rd career post-season goal seemed to take the air out of the Blues, and it got even worse for St. Louis. Sharp got lse for a breakaway, shk off a stick to the face by defenceman Kevin Shattenkirk and slid a shot past Milller.dddddddddddd "The third goal was really a backbreaker for us," Blues coach Ken Hitchcock said. "That was really the one that hurt. We had been chasing them all series and able to catch up in games, but I thought the third goal really tk the wind out of our sails." Sharps first point of the playoffs sent a charge through the towel-waving sellout crowd of 22,144, and there were mocking chants of "Mil-ler! Mil-ler!" as Shaw added his second goal of the series and helped set up Keith for his second. It was an eerily similar playoff exit for St. Louis to a year ago, when the Blues also were eliminated by the defending Stanley Cup champions in six games in the first round. In that 2013 playoff series, St. Louis won the first two games at home against Los Angeles, and then lost four in a row. This year was supposed to be different, especially after the Blues acquired Miller from Buffalo on March 1. But they lost their last six games of the regular season, putting them in a first-round series against rival Chicago. St. Louis rebounded for two 4-3 overtime victories, but the Blackhawks found their stride when the series shifted to Chicago. Crawford had a shutout in Game 3, Patrick Kane scored in overtime in Game 4, and Toews breakaway score in St. Louis put the Blackhawks in position to advance. "It was one play here, one play there," Blues captain David Backes said. "But it was on our stick and we needed to get the job done. We didnt get it done and were going home t early." Chicago defenceman Brent Seabrk returned from a three-game suspension. Seabrk was punished by the NHL for his hit on Backes in Game 2. "It was tough. I cant watch hockey," Seabrk said. "Youre hanging on every shot, every save, every play. You want to be out there helping the guys. It was obviously tough to watch it, but they did a great job." Backes exacted a measure of revenge when he delivered a hard hit on Seabrk into the end boards in the second period. But Seabrk added two more assists and had six points for the series. NOTES: Blackhawks F Kris Versteeg was scratched after he played in the first five games. ... Keith, a top candidate for the Norris Trophy awarded to the NHLs top defenceman, tied a playoff career high with four points. ... Miller, who is eligible for unrestricted free agency, on his immediate future: "I dont know. Ive just got to take things as they come right now. I guess Im free to go to my sister-in-laws wedding. Thats about it." ' ' '