The first action of the Olympic trials saw the heats of the men's 100 metres get under way and it promises to be one of the most closely contested events.
Only James Dasaolu and teenager Adam Gemili have so far achieved the 'A' qualifying standard of 10.18 seconds, meaning finishing in the top two in tomorrow's final would secure their place at the Olympics.
Cool and breezy conditions at the Alexander Stadium made it unlikely anyone else would be achieving the standard, with Dwain Chambers only clocking 10.34s in winning his heat.
"It's always good to get the heat out of the way, now I'm looking forward to tomorrow," said Chambers.
"I want to run fast but I'll just have to do the best I can with the resources I've got and just go for it. It's situations like this when I run my best so I've got to be at my best.
"The main thing is I want to get through the championships in one piece and hopefully that enables me to secure the qualifying time.
"Normally I'm on the top (of the national rankings) so it is a bit daunting that I'm lower down, but I've just got to take each day as it comes.
"Things have happened that have not enabled me to have a smooth journey but I've got to put that to one side and do a good job this weekend."
Gemili also won his heat in 10.27s while Dasaolu was happy enough to settle for second in his heat in 10.45s.