(Reuters)
Updated: 2007-08-03 09:15

Top seed and defending champion Nikolay Davydenko bowed out of the Sopot Open on Thursday after retiring with a foot injury.

Russian Davydenko conceded his second round match to Martin Vasallo Arguello with the Argentine ahead 2-6 6-3 2-1.

"I couldn't run after first set so I decide to withdraw. I have to recover as soon as possible," Davydenko said.

Vasallo Arguello plays Albert Montanes in the quarter-finals after the Spaniard overcame Mariano Zabaleta 4-6 6-3 7-5.

Number two seed Tommy Robredo of Spain prevailed after a fierce battle with Belgian qualifier Steve Darcis, winning 1-6 6-0 6-5 to set up a meeting with Austrian Stefan Koubek.