Jessica Ennis wins 10th track gold of London Games . Dibaba successfully defends her 800m . Tomasz Jessica Ennis retains his men 's shot put crown for Poland . While Dibaba was doubling up , Poland 's Tomasz Majewski became only the second man in history to retain the Olympic shot put title . Home hope Jessica Ennis leads women 's heptathlon after first day .
Jessica Ennis wins 10th track gold of London Games . Dibaba successfully defends her 800m . Tomasz Jessica Ennis retains his men 's shot put crown for Poland . Home hope Jessica Ennis leads women 's heptathlon after first day .