Five men's seeds crashed out on the first day of the Australian Open, but world number one Rafael Nadal was a comfortable winner.
American women struggled on the first day of the Australian Open, with both Venus Williams and Sloane Stephens falling at the first hurdle.
After her win over Miheala Buzarnescu, Caroline Wozniacki insisted she was only focused on her next match and not other results.
Victor Estrella Burgos could do little to stop Rafael Nadal comfortably securing his passage into the Australian Open second round.
World number three Caroline Wozniacki is among the favourites for the women's title at Australian Open and showed why on Monday.
Last year's runner-up Venus Williams praised Belinda Bencic following her straight-sets loss in Melbourne on Monday.
In a four-hour battle, Kyle Edmund overcame US Open runner-up Kevin Anderson at Melbourne Park.
Last year's runner-up and fifth seed Venus Williams was upstaged 6-3 7-5 by Belinda Bencic at Melbourne Park on Monday.
American 13th seed and US Open titleholder Sloane Stephens, 24, was upset 2-6 7-6 (7-2) 6-2 by Zhang Shuai on Monday.
Andy Murray will find it very difficult to return to the peak of his powers after hip surgery, his former coach Brad Gilbert said.