DUBAI, United Arab Emirates -- Novak Djokovic opened the defence of his Dubai Championships title with a straight sets victory over Denis Istomin, while second-seeded Juan Martin del Potro had to retire from his first-round match on Tuesday. Frank Finnigan Jersey . Top-seeded Djokovic, who is making only his second appearance this year after reaching the quarterfinals of the Australian Open, was a 6-3, 6-3 winner over 54th-ranked Istomin of Uzbekistan. "It wasnt as easy as the scoreline indicates," said Djokovic, who has won in Dubai on four occasions. "I needed to work for my games. "Having not played for more than four, five weeks, an official match, obviously it takes its toll on the court." Djokovic saved all four break points he faced on serve and broke Istomin three times -- in the third and ninth games of the first set and in the second game of the second set. Del Potro was not so fortunate, being forced to retire against Somdev Devvarman of India after losing the first-set tiebreaker 7-6 (3). Since winning the Sydney title last month, Del Potro has been struggling with a left wrist injury that has conjured up memories of similar pain he experienced in his right wrist four years ago. In 2010, the year after he won the U.S. Open, he played only three tournaments before and after surgery on his right wrist. Del Potro was fighting back tears in Dubai when he came to talk to the media after his retirement. "I dont feel really well," he said. "My wrist is hurting a lot and everybody knows what happened to me four years ago with my other wrist. "It was really tough to play today. I tried everything. I cannot be the player I would like to be." Having felt the pain in his left wrist during the Australian Open, Del Potro went at the end of January to consult with Dr. Richard Berger, who performed his right wrist surgery at the Mayo Clinic in Minnesota. The doctor recommended a course of physical therapy. Asked if he would have kept playing if he won the first set, Del Potro said: "I dont think so, no. It was hurting too much." Devvarman, a wild card who won a challenger in New Delhi last week, hit a service winner on his third set point in the tiebreaker. That proved to be the final point of the match. "Its unfortunate, especially for a guy like him," Devvarman said. "I realized he wasnt comfortable hitting backhands and I tried to make him hit as many as I could, and he wasnt really hitting over it so I knew he wasnt happy." Third-seeded Tomas Berdych extended his winning streak to eight matches with a 6-3, 6-4 win over Romanian qualifier Marius Copil. Berdych, who reached the final in Dubai last year, won the Rotterdam title two weeks ago. Fifth-seeded Jo-Wilfried Tsonga of France secured a 6-2, 6-4 win over Victor Hanescu of Romania. Cheap Senators Jerseys Authentic . Browns advice worked. Irving scored 20 points, including seven in the fourth quarter, and Cleveland defeated the Los Angeles Clippers 88-82 Saturday night. Irving made his first shot of the night on a layup a little over three minutes into the game. Mike Condon Jersey . -- Washingtons Bradley Beal seemed to make every shot he took in setting a career high with 37 points. http://www.cheapsenatorsjerseys.com/?tag=adidas-chris-wideman-jersey . For the Bombers it has been a combination of things coming together at the most inappropriate moments in time. Quarterback, injuries, Canadian talent or depth and leadership are all issues. Trust me when I say being a Bomber is no fun right now in a city that embraces football the way Winnipeg does. While Buck Pierce will be getting another shot, I think Max Hall does deserve another opportunity.For the first time since the preseason, there is a team other than the Indiana Pacers at the top of the TSN.ca NBA Power Rankings. Entering the All-Star break, the Oklahoma City Thunder have won 14 of 16 games to take over top spot, even without injured star point guard Russell Westbrook. Making a big move up, with the return of point guard Chris Paul, the Los Angeles Clippers jumped from 10 to four, and the surprising Phoenix Suns moved from 15 to 12. 14-5 in the past 19 games, the Brooklyn Nets are up to 15, from 19, their highest ranking since the preseason. The Minnesota Timberwolves are down two starters annd fall from 11 to 14 and the Atlanta Hawks, losers of five straight, fall from 14 to 17. Tom Pyatt Jersey. Down to their last option at point guard, and losers of four straight by an average margin of 25 points, the Denver Nuggets slide from 16 to 19 and the Philadelphia 76ers, losers of seven straight, drop from 26 to 29. The Toronto Raptors are down from one spot, from nine to 10, effectively losing ground to the Clippers upon Pauls return. Scott Cullen can be reached at Scott.Cullen@bellmedia.ca and followed on Twitter at http://twitter.com/tsnscottcullen. For more, check out TSN Fantasy on Facebook. Cheap Diamondbacks Jerseys Cheap Braves Jerseys Cheap Orioles Jerseys Cheap Red Sox Jerseys Cheap Cubs Jerseys Cheap White Sox Jerseys Cheap Reds Jerseys Cheap Indians Jerseys Cheap Rockies Jerseys Cheap Tigers Jerseys Cheap Astros Jerseys Cheap Royals Jerseys Cheap Angels Jerseys Cheap Dodgers Jerseys Cheap Marlins Jerseys ' ' '