2014 champion Stan Wawrinka has not played since losing at Wimbledon and has had surgery on his injured knee. He is on the road to recovery however remains doubtful. He will have had no match practice if he decides to play.
Big serving Canadian and former world number three Miles Raonic called time on his 2017 season after retiring from the Japan Open in October with a wrist injury. Raonic made his return at the Brisbane International but was beaten in straight sets. Based on this preparation it is difficult to see him as being a strong contender.
Who Are Roger Federer's Kids? Know All About Federer's Twins
Edited by Georgina Ker