French Open champion and top seed Juan Carlos Ferrero has pulled out of next week's CA Trophy due to injury, becoming the latest big name to withdraw from the indoor Vienna tournament.
Earlier on Friday, organisers said that the Argentine trio of Guillermo Coria, David Nalbandian and Gaston Gaudio would miss the tournament.
Spain's Ferrero, a finalist at the U.S. Open, was forced to withdraw with a serious heel injury.
Coria, seeded third, withdrew due to a thigh injury, Nalbandian with hand and stomach problems and Gaudio because of a damaged elbow.
Coria has already qualified for the prestigious Masters Cup in Houston from November 8-16 but Nalbandian is still fighting for one of the remaining five places.
The former Wimbledon runner-up stands eighth in the ATP Champions Race, with the top eight players qualifying for Houston.
The top seeds in Vienna are now defending champion Roger Federer, Carlos Moya and Jiri Novak.