Del Potro out, Anderson wins

Florida - 2009 US Open winner Juan Martin del Potro was at a loss for words after his fourth-round loss in the ATP Miami Masters Tuesday at the hands of American Mardy Fish 7-5, 7-6 (7/5).

"It's difficult to say something now because I just lost a very, very tough match," said the Argentine whose comeback progress from 2010 wrist surgery was halted by the American who is on his way to taking over the top national ranking after the early exit here of Andy Roddick.

"Maybe in two or three days I can say my level at the moment and what I expect for the future."

Del Potro has chosen not to play the start of the upcoming clay season and will consult with his doctors before taking a scheduling decision. He has been reportedly considering a return in Estoril, Portugal, in a month.

"I would love to play in Estoril. But after here, I will see the doctor, and then we will take a decision if I can still play or if I need to stop.

"I want to play there but I've not played on a clay court since 2009, so it's a long time. I want to improve my game in that surface."

The pair took almost two and a half hours to get through two sets, with Fish winning the first on his sixth set point.

In other results on a day full of matches after rain postponements the night before, Spanish sixth seed David Ferrer beat compatriot Marcel Granollers 6-1, 6-2 and South African Kevin Anderson put out American John Isner 6-3, 7-6 (7/4).

There was third-round disappointment for Jo-Wilfried Tsonga as the French 15th seed was unable to recover in his rain-interrupted match from Monday.

Ukrainian Alexandr Dolgopolov finished off the final set to post a 6-7 (2/7), 6-4, 7-5 win and set up a date with top seed Rafael Nadal, still looking to earn his first Miami trophy after losing two finals.