Ethiopian Tirunesh Dibaba made a successful defense of her Olympic 10,000 meters crown to round off the first night of track and field finals Friday . Tirunesh Dibaba wins first track gold of the London Olympics . The Ethiopian won her second Olympic marathon title in a row and set an outright world record with a time of two hours 13 minutes 17 seconds. Tomasz Majewski retains his men 's shot put crown for Poland . Home hope Jessica Ennis leads women 's heptathlon after first day .
Tirunesh Dibaba wins first track gold of the London Olympics . The Ethiopian won her second Olympic marathon title in a row and set an outright world record with a time of two hours 13 minutes 17 seconds. Tomasz Majewski retains his men 's shot put crown for Poland . Home hope Jessica Ennis leads women 's heptathlon after first day .