Dustin Johnson can't comprehend how golf's world rankings work, but for the past year he's checked every Monday to make sure he's still No.1.
The big-hitting American returns to defend his LA Open crown at Los Angeles' famed Riviera Country Club one year after ending Jason Day's 47-week reign at the top.
Holding the No.1 spot this long puts Johnson in elite company.
He joins Australian icon Greg Norman, Tiger Woods, Nick Faldo and Rory McIlroy as the only golfers since the rankings began in 1986 to remain at the summit for at least 52 consecutive weeks.
"Yeah, I check them," Johnson said on Wednesday
"On Mondays, usually (when they are updated). Just to see what's going on."
The world rankings operate on a two-year rolling system.
Points are allocated to an event according to the strength of its field and then awarded to players based on their individual result.
Those points remain on a player's tally for two years (up to a maximum of 52 events), but are reduced on a sliding scale after 13 weeks.
Each player is then ranked according to his average points per tournament, calculated by dividing his total by tournaments played.
Since 2014, only McIlroy (54) and Woods (60) have held it for longer than a year, with 14-time major champion Woods owning the overall record for consecutive (281) and total (683) weeks.
"It's definitely difficult to stay No. 1. The guys out here are very, very good and there's a lot of very talented players. But for me, I use it as motivation to keep working harder," Johnson said.
Despite kicking off the year with an eight-shot win at the Tournament of Champions in Hawaii, Johnson faces a title contender in Spanish young gun Jon Rahm.
World No.2 Rahm, who has two wins and a second in his past six starts worldwide, could have surpassed Johnson at last week's Pebble Beach Pro Am, but Johnson cemented his status with a tie for second.
"I can't really control what the other guys are doing," Johnson said.
"(Rahm) has had chances; somebody's probably eventually going to pass me, but hopefully not."
With a win and a runner-up in his first two starts of the year, 30-year-old Day has also put his hand up to reclaim No.1 spot.
"I've got a long way to go," he said.
"But you've got to start somewhere and you've got to take little steps."
- Evin Priest, Australian Associated Press