Milos Raonic hits a return against Switzerland's Stanislas Wawrinka. Photograph:( AFP )
Raonic will face South Korea's Hyung Cheon or Pierre-Hugues Herbert of France in the third round.
Stan Wawrinka lost to 16th seed Milos Raonic in the second round of Australian Open on Thursday at Rod Laver Arena.
The 2014 champion Wawrinka, unseeded for the first time since his debut in 2006 after being plagued by injury, fell to the Canadian after four sets decided on tiebreaks 6-7 (4/7), 7-6 (8/6), 7-6 (13/11), 7-6 (7/5).
Raonic, who got to the Australian Open semi-finals in 2016 before losing to Andy Murray, will face South Korea's Hyung Cheon or Pierre-Hugues Herbert of France in the third round.
The 28-year-old Raonic battled for 2️4️1️ minutes, the longest match has ever played and won in his career, in the tightest of second-round battles.
The reserved Canadian raised his fists in triumph after his Swiss opponent misfired on his forehand on match point.