By Sarah Holt
BBC Sport at Wimbledon
Justine Henin-Hardenne's title challenge ended when she fell to a shock 7-6 2-6 7-5 first-round exit at the hands of unseeded Eleni Daniilidou.
The French Open champion was edged out in a marathon first set tie-break 10-8 but raced through the second to level the match and set up hopes of victory.
Daniilidou fought back in the decider and after receiving treatment on her knee, had two match points at 5-4.
Henin-Hardenne held on but could not do it twice, losing on a double-fault.
After finishing the clay-court season unbeaten, Henin-Hardenne was expected to challenge at Wimbledon.
But the 23-year-old Belgian lacked her usual on-court composure, making 48 unforced errors and conceding 11 double-faults - the last of which was fatal.
Henin-Hardenne admitted she could make no excuses for her error-strewn performance but said she was still struggling with a hamstring injury.
"My injury has got worse in the past few days so that made it difficult for me," Henin-Hardenne said.
"I got tight and was thinking about my injury and things got worse."
Eleni Daniilidou believes a positive frame of mind was the driving force behind her shock victory over the seventh seed.
"For every player it's tough mentally but I think I was better on that," said the Greek world number 76.
"Justine is pretty dangerous on grass but I thought, 'let's just go for it, and really try my best', so I'm happy.
"I had a lot of calls after the match from Greece but there is no real pressure on me so that's good."
Daniilidou's best performance at Wimbledon was in 2002 when she reached the fourth round.