American Andy Roddick announced he has split from his coach Jimmy Connors after beating world number two Rafael Nadal 7-6 (7-5) 6-2 at the Dubai Open.
Roddick and Connors had been working together since July 2006
Roddick began working with Connors, an eight-time Grand Slam champion, in July 2006 and blamed "logistical reasons" for the split.
"Jimmy resigned, about a week ago," said Roddick, 25. "I think it was tough for him to do it part-time.
"I'm sad but thankful for the time he took out of retirement to give to me."
There had been rumours about the pair's relationship after Connors showed up late to the Australian Open, where Roddick lost in the third round to Philipp Kohlschreiber.
Connors is credited with reigniting Roddick's spirit and enthusiasm for the game and helping him reach the final of the US Open in 2006.
Under Connors's guidance, Roddick also led the US team to victory in the Davis Cup in 2007.
The thing about Jimmy is you don't just learn stuff about tennis
"When we got together I was as close to down and out as I've been," said Roddick, the world number six.
"I really credit him for that spark and getting me back to the top five. He's helped my backhand a ton - it's a lot more solid.
"He maybe did not exactly get the results he wanted, but at the same time he was retired even before we started.
Roddick confirmed it was Connors who officially made the split largely because of the pressures of spending so much time on the road.
"You try to understand where someone's head is at, from a distance, as well as you can," said the American.
"But when I am going from Australia to Austria to California to Memphis to Dubai it becomes difficult.
"I really enjoyed my time with him. The thing about Jimmy is you don't just learn stuff about tennis."
Roddick intends carrying on without a coach for the time being. He travels with his brother John Roddick and former ATP trainer Doug Spreen.