Germany's Tommy Haas will miss the rest of the season after failing to recover from a shoulder injury.
Haas accepts that his season is over
The 25-year-old has had two operations on his shoulder, but has decided not to try and rush back in to competitive action.
"This season is over for me," the German Davis Cup player revealed.
"There is nothing worse than wanting to do your job and not being able to."
Haas showed early promise by climbing in to the top 10 rankings but his career has been dogged by injuries.
The German has not played a tournament since last October, but is targeting a return to the practice courts in September.