British team captain Dai Greene has safely advanced to Saturday's athletics semi-finals of the 400m hurdles after winning his heat.
The world champion found himself drawn in the tight inside lane, but was largely untroubled as he clocked a time of 48.98s to go through fourth fastest overall, with world number one Javier Culson of Puerto Rico quickest in 48.33.
"It was relatively easy," Greene said. "I struggle to get up for the heats usually so I just had to make sure I qualified as winner of my heat."
European champion Rhys Williams was only fifth in Culson's heat but a season's best of 49.17 comfortably saw him advance as one of the six fastest losers, while Jack Green - a training partner of Greene in Bath - went through automatically by finishing second behind former Olympic champion Felix Sanchez in the final heat.
Williams said: "I had flashbacks to Berlin (2009 world championships) when it went down to the slowest qualifier and I didn't get through. I am delighted to be through but I've got to pick it up tomorrow and I will.
"I was pretty nervous (waiting to see if he went through) probably the most nervous I have ever been. But I am glad I am through. I have never experienced anything like that atmosphere."
Defending champion Christine Ohuruogu comfortably advanced to the semi-finals of the 400m after finishing second in her heat in 50.80, and was joined by team-mate Shana Cox - who was third in her heat in 52.01 - before a torrential downpour hit the stadium.
The rain thankfully did not last long and Scot Lee McConnell was able to enjoy a dry run in the fifth heat of the 400m, finishing third to join Ohuruogu and Cox in the semi-finals.