 Baghdatis beat Jesse Witten in the first round |
Cyprus' Marcos Baghdatis is out of the US Clay Court Championships after being forced to retire from his second round match against America's Vince Spadea. Fourth seed Baghdatis, the Australian Open runner-up, was trailing 6-2 3-1 when he called it quits, complaining of a nerve problem in his lower back.
Spadea will play fellow American Mardy Fish in the quarter-finals.
Germany's Rainer Schuettler was battling a gastrointestinal problem and handed Fish a walkover.
American Paul Goldstein reached his second quarter-final of the year with a 6-4 6-1 win over countryman Scoville Jenkins.
Goldstein next plays Spaniard Albert Montanes, who beat German Tomas Behrend 6-2 6-3.
Austrian Jurgen Melzer advanced to his first quarter-final of the year with a 7-6 (7-2) 6-4 win over Brazilian Marcos Daniel.
The highlight of Friday's quarter-finals will be the clash between defending champion Andy Roddick and Germany's Tommy Haas.