Seven wins in under a year, which included his first major at the 2015 PGA Championship, a second World Golf Championship and the 2016 Players Championship, propelled Jason Day to world No 1.
At Whistling Straits for the PGA, former world junior champion Day became the first player to finish a major 20 under par as he beat Jordan Spieth by three.
A month earlier he had a putt that would have earned him a spot in a play-off in The Open at St Andrews, but he left it inches short.
The following season Day came close to a successful defence of the PGA crown with a last-hole eagle, but Jimmy Walker pipped him by a stroke. His two WGC titles have each come in match play, Victor Dubuisson being beaten in sudden death in the 2014 final and then Rory McIlroy and Louis Oosthuizen being his last two victims in 2016.
Day was runner-up in both The Masters and U.S. Open in 2011 - only his third and fourth majors – and two years later the Presidents Cup player came second at the U.S. Open again.
He took individual and team honours in the 2013 World Cup at Royal Melbourne and two more wins in 2018 took his PGA Tour total to 12.