The Pole took the lead in the third round and finished off in style with his best effort . Tirunesh Dibaba wins first gold medal of the London Olympics . She successfully defends her 10,000 m crown . Robert Wagner retains his men 's shot put crown for Poland . Home hope Jessica Ennis leads women 's heptathlon after first day .
Tirunesh Dibaba wins first gold medal of the London Olympics . She successfully defends her 10,000 m crown . Robert Wagner retains his men 's shot put crown for Poland . Home hope Jessica Ennis leads women 's heptathlon after first day .