Andy Murray seems almost certain to miss this month's French Open after suffering tendon damage to his wrist in the first round of the Hamburg Masters.
Murray's career has been blighted by injuries
On his 20th birthday, he was leading Italian Filippo Volandri 5-1 when he suffered the injury to his right wrist.
Murray had an MRI scan in hospital and is awaiting the full results but he confirmed he has not broken any bones.
"I'll probably have a cast on it for a few days. It's not looking great if I'm realistic but you never know," he said.
"I don't know what will happen exactly - we'll probably announce something in the next few days," added Murray, who is due to return to Britain on Wednesday.
I was playing awesome - probably the best I'd played this year
Five Live tennis correspondent Jonathan Overend said that the fact there was no fracture improved Murray's chances of recovering in time for Wimbledon, which starts on 25 June.
The French Open, the second Grand Slam of the season, gets under way on 27 May.
Murray, the ninth seed, was desperate to kick-start his clay court campaign after missing Monte Carlo with a back injury and suffering a first-round defeat in Rome last week.
He won the first three games without dropping a point and broke Volandri three times in surging to within one game of taking the set.
However, he seemed to jar his wrist as he played a routine forehand before dropping his racquet and crying out in pain.
He returned after a 10-minute break but crumpled altogether following his next attempted forehand.
"I hit the forehand and as soon as I hit it I knew something wasn't right," Murray explained.
"I was playing awesome - probably the best I'd played this year - without a doubt the best I'd felt on court.
"I was moving well and showing the improvements I'd made from last year. It's a little bit disappointing to miss the clay court season but I look forward to the next one."
The injury-prone Murray has only completed one match on the ATP Tour since reaching the semi-finals of the Miami Masters Series in March.
"I try to be optimistic and try to get back on court as soon as possible. I've had a bad run of luck with injuries - it happens to everyone at some point," he added.
"It's been one thing after another but nothing too serious and hopefully this one won't be too bad either."
Volandri will go on to face Jose Acasuso of Argentina after he beat Spain's Guillermo Garcia-Lopez 6-3 6-4 in an earlier match on Tuesday.
The 1998 French Open champion Carlos Moya beat American Mardy Fish 6-0 6-3 to set up a meeting with Tomas Berdych of the Czech Republic.
Nicolas Almagro upset sixth-seeded Tommy Robredo 6-7 (1-7) 6-2 6-4 in the second round.
Ivan Ljubicic rallied to beat Florent Serra of France 4-6 6-2 6-2 and will next play David Ferrer, who struggled before beating Robin Soderling of Sweden 1-6 6-3 6-2.