Rafael Nadal made a winning start to his Australian Open campaign with a comfortable 6-3 6-4 6-4 victory against Germany’s Florian Mayer.
He is the 6/4 favourite to win his quarter of the draw but faces tough competition, including from fellow Spaniards David Ferrer and Roberto Bautista-Agut.
Here we assess the biggest threats to Nadal’s hopes of reaching the semi-finals.
MILOS RAONIC (7/4)
The big-serving Canadian is at his highest ranking of three and has his sights firmly set on a first slam title. He came very close to upsetting Andy Murray in the semi-finals 12 months ago and then lost to the Scot in his first slam final at Wimbledon. Raonic powered down 18 aces on his way to a straight-sets win against Dustin Brown in the first round and is now 9/50 to get past Gilles Muller.
ALEXANDER ZVEREV (6/1)
The 19-year-old is the world's highest-ranked teenager and it appears a matter of when rather than if he will win a grand slam title. The German has an excellent temperament and few weaknesses and can already boast two wins over Roger Federer, including this month at the Hopman Cup. He defeated Stan Wawrinka to win his first ATP Tour event in St Petersburg last September.
ROBERTO BAUTISTA-AGUT (8/1)
The 13th seed took just 83 minutes to ease to a 6-3 6-1 6-1 win against Argentina’s Guido Pella in the first round so should still feel fresh when he faces Japan’s Yoshihito Nishioka. Bautista Agut, who reached the fourth round last year, is 1/10 to beat Nishioka and is on course to meet compatriot David Ferrer in round three.
GAEL MONFILS (10/1)
Monfils, at sixth, is the second highest seed in this quarter of the draw and eased through his first-round match against Jiri Vesely, losing just seven games. The Frenchman ended 2016 at his highest-ever place in the rankings and reached the quarter-finals in Melbourne for the first time last year so will be hoping to improve on that performance.
DAVID FERRER (20/1)
At the age of 34, Ferrer’s best days may be behind him and he is seeded 21st but he has reached the semi-finals in Melbourne twice before, most recently in 2013. He proved experience can conquer youth in the first round with a 6-3 6-0 6-2 thrashing of local teenager Omar Jasika and his best grand slam performance of 2016 was at the Australian Open as he made it to the last eight.