Tyson Gay sent another warning to Usain Bolt that he has the credentials to defend his 100 metres world title with another stunning performance tonight.

World 100m record holder Usain Bolt has promised “something very special” when he competes over his preferred 200m distance at the Aviva London Grand Prix on July 25-26.

Scotland’s Lee McConnell has quit the 400metres hurdles and set her sights on Olympic glory in the flat one-lap event.

Joanne Cuddihy made a confident start to her World Championship campaign in Osaka with a season's best in her 400 metres heat, but the Kilkenny woman will have it all to do to progress out of tomorrow's semi-finals.