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Andy Roddick began his 2009 season with a comfortable win and an ambition to recapture the form which took him to victory over all three Grand Slam champions early last year.

The former world number one from the United States also spoke passionately about his desire to maintain full fitness after winning 6-1, 6-3 against Ivan Navarro, the world number 73 from Spain.

"Last year I was just going from the training table straight on to the court," Roddick said after reaching the second round of the 1,100,000-dollar Qatar Open.

"I was going to do everything to play Wimbledon and I shouldn't have and I was advised not to; I was hurt in Cincinnati and tried to play LA.

"When you do that you don't have all the options," he concluded by way of explanation of how his results fell away after beating Rafael Nadal and Novak Djokovic in Dubai in February and Roger Federer in Miami in March.

Roddick believes his injury problems may have been related to not taking a full close season's rest and training programme at the end of 2007.

Now, however, he feels he has taken a better break and done more of the necessary work, and also has high hopes of his relationship with his new coach, Larry Stefanki, formerly with two other world number ones, John McEnroe and Marcelo Rios.

"I've had more time to prepare and it makes a huge difference," Roddick said. "I feel last season was stalled by injury and now I feel better. I thought I made a pretty solid start."

Tuesday, Federer, Nadal and Andy Murray also begin their campaigns on the ATP World Tour.

Federer, the US Open champion and the winner of 13 Grand Slam titles, faces Potito Starace, the world number 70 from Italy, while Nadal, the top-seeded Wimbledon, French Open and Olympic champion, meets Fabrice Santoro, the 36-year-old former titleholder from France.

Murray, the 21-year-old Briton who beat both Nadal and Federer in the exhibition event in Abu Dhabi at the weekend, begins against Albert Montanes, a top 50 Spaniard, and is seeded to reach a semi-final with Federer on Friday.