Rory McIlroy has made it a career total of 60 weeks as world number one with the release of the final golf rankings of the year.
The Northern Irishman started the year as world number six, but after wins in the British Open in July and in the WGC-Bridgestone Invitational at the start of August he was back at the top.
He cemented that position with his fourth major title win at the US PGA Championship and ended the year almost three ranking points clear of second-placed Henrik Stenson of Sweden.
Australia's Adam Scott, who held the number one ranking for a short period of time earlier in the year, was third.
Tiger Woods, who was top-ranked at the start of the year, slumped to number 32 due to a run of injuries and related problems with his swing.
Masters champion Bubba Watson was the top-ranked American at fourth with Japan's Hideki Matsuyama the top Asian player at number 16.