Nadal targets improvement despite win

Rafael Nadal has hit the ground running at the Australian Open - winning through to the quarter-finals without dropping a set - yet he accepts an improvement is required over the next week if he is to land his 11th Grand Slam title.

Nadal continued his dominance of Spanish compatriot Feliciano Lopez today, winning 6-4 6-4 6-2 to ease into the last eight in Melbourne.