Melbourne: World number one Rafael Nadal fought off a spirited challenge from Japan's Kei Nishikori to win through to the quarter-finals of the Australian Open on Monday. The Spaniard won 7-6 (7/3), 7-5, 7-6 (7/3) in three hours 17 minutes and will play Bulgaria's Grigor Dimitrov in the last eight. (Click here for latest on Australian Open)
Nishikori, under new coach Michael Chang, pressed Nadal all the way and had his chances to take sets off the top seed only to fall down on forehand errors.
Nadal was angered when he was called for a time violation by chair umpire Eva Asderaki at deuce while 4-4 at a critical time in the third set, but he regathered his composure to win the match in his second tiebreaker.