With a win at the PGA Championship, Dustin Johnson could move to No. 1 in the world ranking.

If world No. 2 Dustin Johnson wins the PGA Championship this weekend, he would leapfrog over current No. 1 Jason Day and become just the 20th player to occupy the top spot. This would end Day’s run of 18 consecutive and 22 cumulative weeks at the summit. His current stint began at the end of March, when he passed Jordan Spieth.

Johnson has had a career year in 2016, finally capturing his first major with a confident victory at the U.S. Open at Oakmont. In his last six starts dating back to early June, he hasn’t finished worse than a tie for ninth, his result at The Open Championship. Check it out:

Date Event Finish Score To Par June 2nd Memorial Tournament 3rd 274 -14 June 9th St. Jude Classic 5th 271 -9 June 16th US Open 1st 276 -4 June 30th WGC-Bridgestone 1st 274 -6 July 14th Open Championship T9 282 -2 July 21st RBC Canadian Open T2 277 -11

With that kind of recent form, there is no doubt Johnson deserves the coveted No. 1 spot in the ranking. However, Johnson isn’t the only player with something on the line this week.