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WASHINGTON -- Even before Ryan Harrison broke his racket by spiking it on the Citi Open court or screamed "Oh, my God!" in exasperation, top-seeded Juan Martin del Potro was feeling pretty good about the way things were going Thursday. And they kept improving for the 2009 U.S. Open champion. Back in action after nearly a month off, del Potro won twice in a span of about 7 1/2 hours to reach the Citi Open quarterfinals. Del Potro started by winning a rain-postponed match against 107th-ranked American Harrison 6-1, 7-5, then returned to the court under the lights at night to defeat 14th-seeded Bernard Tomic of Australia 6-3, 6-3. Each lasted about 70 minutes. "Really good day," del Potro said, smiling as he leaned back in his chair and stretched out his legs. "The match against Tomic was a little better than the first one." Del Potro, who received a first-round bye, is 11-1 at the hard-court tournament in Washington, where he won titles in 2008 and 2009. The Argentine, No. 7 in the ATP rankings, hadnt competed since July 5, when he was eliminated in five sets by No. 1 Novak Djokovic in 4 hours, 43 minutes, the longest semifinal in Wimbledon history. "I was training hard before coming here," said del Potro, who will face No. 7-seeded Kevin Anderson, also a winner twice Thursday. Anderson eliminated James Duckworth 6-3, 3-6, 6-4, then beat Mardy Fish of the United States 7-6 (2), 6-1. Before that match finished, Fishs withdrawal from next weeks tournament in Montreal was announced; the event said he pulled out for personal reasons. "Its hard for me, right now, to come out and just play every single week," said Fish, who has missed time the past two seasons while dealing with a heart condition. "I still know I have a long ways to go to get back to where Id like to be and where I was, maybe, 12 months ago," he added. The other mens quarterfinals are No. 8 John Isner against No. 16 Marcos Baghdatis, No. 3 Tommy Haas against No. 11 Grigor Dimitrov, and Marinko Matosevic against Dmitry Tursunov. Matosevic beat No. 4 Milos Raonic of Canada 7-5, 7-6 (7); Baghdatis surprised No. 2 Kei Nishikori of Japan 6-1, 6-2; the 35-year-old Haas finished off a second-round match suspended overnight in the third set, then also won Thursdays last match, 6-4, 4-6, 7-5 against No. 13 Ivan Dodig, wrapping it up after midnight. Del Potro said his left knee felt fine; he wasnt wearing any sort of wrap the way he did at the All England Club after hyperextending it on a fall during a match. "You never know" how the knee will hold up, said del Potros coach, Franco Davin. "For now, its OK." Harrison was ranked inside the top 50 last season and is widely seen as the next top American male player. "He has good potential. He serves well. He plays well on hard courts. But sometimes he looks young," said del Potro, who was a couple of weeks shy of his 21st birthday when he won the U.S. Open. "Hes still 21. He needs to learn a few things to become a better player in the future." Harrison trailed 4-0 after only 11 minutes. Both men hit serves at the considerable speed of 130 mph, but the difference was that once the ball was in play, del Potros groundstrokes were far more consistent. "Sometimes you go out there and for whatever reason, its not feeling as well as you want it to," said Harrison, 0-18 against top-10 players. "The best guys, whenever they see someones off, they just press you, and they just make you feel like youre under duress all the time." After pushing a forehand long to get broken at 3-0, Harrison smashed his equipment, earning a warning from the chair umpire for racket abuse. During a particularly rough stretch from late in the first set to early in the second, Harrison dropped 13 consecutive points, a drought that ended right after he dumped a backhand in the net, looked to the sky and yelled. From there, he played evenly against del Potro, until getting broken in the last game. Del Potro thinks Harrisons histrionics help foes. "Its easier for us, because we ... (see) our opponent really, really low," del Potro said. Three other American men joined Harrison on the way out: No. 6-seeded Sam Querrey, Jack Sock and Tim Smyczek. In womens action, the only seeded player to lose was No. 8 Madison Keys of the United States, who failed to convert two match points and bowed out against Monica Niculescu 6-1, 2-6, 7-6 (6). The womens quarterfinals are No. 1-seeded Angelique Kerber vs. No. 7 Magdalena Rybarikova, No. 3 Ekaterina Makarova vs. Niculescu, No. 4 Alize Cornet vs. Sorana Cirstea, and Andrea Petkovic vs. Paula Ormaechea. The most unusual ending to a match Thursday came when Olga Puchkova of Russia was defaulted by the WTA supervisor after hitting a line judge in the knee with a ball between points. Trailing Ormaechea 3-6, 6-3, 4-1, Puchkova was forced to forfeit even though she said it was an accident. Nike Air Max Canada Online . Louis Cardinals. Victorino is batting sixth and playing right field after missing two games because of back tightness. Air Max 270 Mens Canada . Westbrook has missed 27 games since having a procedure on Dec. 27 to deal with swelling in his injured right knee — the third operation on the knee in nine months. http://www.clearanceairmaxcanada.com/air-max-tailwind-canada-sale.html . The team said Saturday that Lopez was hurt during its 121-120 overtime loss at Philadelphia on Friday. The Nets said they would issue another update next week after consultation with their doctors. Air Max 270 Sale Canada . The winner Saturday will remain in the elite 10-team field next year. "We talked about wanting to be disciplined and stick with our game plan and good things will come," Draisaitl said, who had two goals for the victors. Cheap Nike Air Max Canada . -- Ty Montgomery had 290 all-purpose yards and two touchdowns, and fifth-ranked Stanford held on to beat No. BUFFALO, N.Y. -- Just as soon as the Buffalo Sabres get some positive injury news, they receive another setback on the injury front.After Evander Kanes long-awaited return on Wednesday, the Sabres announced Thursday that center Tyler Ennis is expected to miss several weeks after undergoing surgery to repair a groin injury.Its disappointing for Tyler, said Sabres head coach Dan Bylsma, according to the teams website. This is a situation hes been dealing with for the past little while, days, maybe a week. Im kind of just extremely disappointed to get the news that hes going to be out for a bit of time, have the surgery which he had this morning. Hes had a tough go getting on the ice and playing games for the last nine months.The skilled playmaker has been struggling with injuries going back to last season, when he played in just 23 games.Top center Ryan OReilly and defenseman Dmitry Kulikov missed practice on Wednesday and their status is up in the air for Fridays game against the New Jersey Devils (6-3-3). OReilly was unable to play in Buffalos 2-1 shootout loss to the Ottawa Senators on Wednesday, and the Sabres missed his presence in the offensive zone. Both teams struggled to put together any offense in a defensive-minded clash.Sabres goalie Robin Lehner (4-4-0, .929 save percentage) has gotten off to a fine start to the season but is expected to take Fridays game off before returning in the second half of a home-and-home series against the Devils. In his place is Anders Nilsson, who has exceeded early expectations with a save percentage of .dddddddddddd.937 in three games.No matter who is between the pipes, the Sabres will need a better offensive effort. Aside from an overtime period in which Buffalo held the upper hand (outshooting Ottawa 8-0), neither team had much offense in the shootout defeat on Wednesday.The Devils are coming off back-to-back wins over the Carolina Hurricanes. New Jersey defeated Carolina 4-1 on Sunday before a 3-2 win shootout win over the Hurricanes on Tuesday.Left winger Michael Cammalleri had a hat trick in the 4-1 victory over Carolina, recording his first three goals of the year. Waiver-wire acquisition P.A. Parenteau came up big in the shootout win over Carolina, scoring in both regulation and the shootout.Parenteau was claimed off waivers just before the start of the season from the New York Islanders and has been a difference-maker. Hes currently tied for the team lead in goals with five.I dont know if I want to prove something, to be honest, Parenteau said, according to The Record. I just want to put that behind me. Im happy where I am right now and things are working out, and this is a good hockey team that Im part of and the boys have made it easy for me.He brings a lot of skill, left winger Taylor Hall said, according to The Record. Hes a guy thats always looking to make a play. Were trying to get him to shoot more and have more of that. ' ' '