Usain Bolt and Yohan Blake breezed through their respective 200m semi-finals on Wednesday, meaning an unprecendented second sprint double for Bolt could still be on the cards.

Bolt blitzed the first 100m to allow a gentle jog on the home straight for a heat-winning time of 20.18 seconds.

Victory in the final would make him unquestionably the sport's greatest ever sprinter.

Wallace Spearmon is likely to battle it out with former European champion Christophe Lemaitre for bronze.

Blake, this year's fastest man, also looked impressive, running a strong bend before easing down for the night's best time of 20.01.