Mardy Fish had no second thoughts about retirement after pushing Feliciano Lopez to five sets in his US Open exit on Wednesday.

The American veteran went down 2-6 6-3 1-6 7-5 6-3 to Spanish 18th seed Lopez in what was his final professional match.

Fish, a former world number seven, has barely played since 2013 due to a severe anxiety disorder.

On his farewell tour in United States, the 33-year-old beat Viktor Troicki and tested Andy Murray in Cincinnati, before reaching the second round at Flushing Meadows.

Asked if he felt he should keep going, or if he had second thoughts, Fish said: "No, no," before adding: "None."

Fish is a three-time grand slam quarter-finalist, reaching the last eight at the 2007 Australian Open, 2008 US Open and 2011 Wimbledon.

Asked what message he wanted people to take from his career, Fish said: "I don't know. I mean, I've got a lot of great memories... I've got a lot of good wins out here.

"I have made a lot of really good friendships with almost everyone out here. You know, I'll miss that. I can't answer that. I mean, I'm not sure.

"Someone else, other people, you guys, have to answer the career part. And then the health stuff, I'm just trying to help any way I can and share my story. Like I say, if it helps other people, that's great."

Fish reflected on the disorder that cut short his career and said the raised expectations had been too much for him.

"Expectations changed and pressure was a lot higher and a lot more on myself and from others. I mean, that's how it all happened. That's how it all came. Expectations changed," he said.

"There was a lot more pressure on myself to play well at every event, and every week.

"That was the position that I wanted to be in, the top American, top 10 in the world, and [I became] sort of a marked man. It was too much for me to handle."