American Chris Horner has once again been plagued by the bad luck which has haunted him all season. The Astana rider was one of dozens of riders involved in a crash in the final kilometres of the Vuelta a Espana's stage four on Tuesday, and his team confirmed that he has an "undisplaced fracture of the wrist".
Horner will not continue the race as the risk of the break becoming worse over the next two weeks is too great, his team said.
It is the third serious injury of the 37-year-old rider's 2009 season. In February, he injured his knee in the Tour of California. In April, he broke his collarbone and ribs in a crash at the Vuelta a Pais Vasco after his teammate Daniel Navarro broke his chain and fell in his path.
Horner again recovered from his injury, but not in time to be selected for Astana's Tour de France squad. He sat out much of July, returning to competition at the Tour of Elk Grove before heading back to Europe where he nearly won the Tour de l'Ain.
"I'm done for the year, for sure. My season is over, but I'm not stopping cycling!" Horner declared in an interview posted on his team's web site.
Astana's newest recruit, Alexander Vinokourov, was also injured in the wreck on Tuesday. He sustained a wound to his left elbow and hip, but will continue the race.