Nadal, Murray, Federer and Dimitrov race into Australian Open quarterfinals

Australian Open

Fourth-round results:

[1] Rafael Nadal (ESP) d. [16] Kei Nishikori (JPN) 76(3) 75 76(3)
[4] Andy Murray (GBR) d. Stephane Robert (FRA) 6-1, 6-2, 6-7(6), 6-2
[6] Roger Federer (SUI) d. [10] Jo-Wilfried Tsonga (FRA) 63 75 64
[22] Grigor Dimitrov (BUL) d. Roberto Bautista Agut (ESP) 63 36 62 64