Bolt mystified by worst run 'since 2009'

Usain Bolt admitted he could not explain a disappointing performance in his first race of the track season in Ostrava.

The world-record holder clocked 10.04sec in the 100m after what he dubbed a "very bad day at the starting blocks" in the Czech Republic.
The double sprint gold medallist from the 2008 Beijing Games Olympic suffered a dreadful start and grimaced his way from the 50m mark into a -0.8m/s headwind, while also opening up a lead on his rivals to the line. Veteran Kim Collins, of St Kitts and St Nevis, finished second in 10.19sec, with American Darivs Patton third in 10.22sec.

Bolt said he he had not run as badly since a race in Canada in 2009. "I don't really know what went on," he said. "At the start, I didn't feel as explosive as I normally feel. If you don't get that first start, well, that's where my power comes from for the transition and everything comes together.
"That's reality, a very bad day at the starting blocks. I don't know exactly where it went wrong. I was looking forward to coming here and doing a good time. I guess it's just one of those days."
Bolt said he had not managed to generate his crucial "drive" phase of his race from 50m. "When I was warming up, I did some starts and I was flying," he said. "I ran out and didn't get going, couldn't generate speed up in middle of race so I had to work hard to get some speed up."
Bolt added: "I'll go back, look at the replay, talk to my coach and he can explain what I need to do and then I can go to Rome and improve on my time."