Did this list in the tennis thread too so I'll carry it over to the golf thread.
Top 10 golfers of the 2010s:
1. Rory McIlroy (Despite winning no majors since 2014, Rory still leads in virtually all metrics, hence giving him a well deserved claim at being the golfer of the decade)
2. Brooks Koepka (Currently, the most dominant golfer on the world and despite only being on tour for a few years, already has 4 majors and that total looks to only be going up and going up fast in the next decade)
3. Dustin Johnson (The most consistent golfer of the decade, but he's also been the golfer who's suffered the most heartbreaks this decade and as of 2019, he's only won one slam in what has been an otherwise stellar decade/career. As a result, he's below Rory and Brooks on this list)
4. Jordan Spieth (It's been a tough couple years for Spieth but let's not forget how dominant he was for a couple years where every tournament was his to lose and every putt was dropping in left and right. Oh and he's still only 26; he's far from being finished)
5. Tiger Woods (It's been a turbulent decade for Tiger but he's ended it on quite a high note the past 2 seasons. Despite that he's still won a Masters, a Players, 2 WGCs, one POY and 11 titles in the 2010s, which is a resume only the 4 above him can top)
6. Justin Thomas (In modern golf, only Tiger, Jack, Rory and Spieth can match what Thomas has done by age 26. Despite being a minor at the start of the decade, he's already racked up an abundance of achievements)
7. Jason Day (He was a top tier golfer for a couple years but his level has dropped a bit since then. Despite that, he's still picked up a major, a Players, 2 WGCs, and won 12 titles in the 2010s, including that dominant display where he out-dueled peak Speith at the 2015 PGA)
8. Justin Rose (After a turbulent 2000's decade, the 2010s treated Rosey well. He's won a major, a gold medal, a FedEx Cup and 14 worldwide titles just to name a few achievements. He's also been very consistent year in year out from the start of the decade till the end)
9. Martin Kaymer (Now this is one name us North American golf fans haven't heard of in a while. Despite that he's somewhat quietly had a HOF career throughout the 2010s winning 2 majors, a Players, 1 WGC, and has been world number one)
10. Bubba Watson (Similar to Rose, his career was stagnant throughout the 2000's but the turn of the decade was like a giant bright door opened up for the fan favorite, Bubba. He's won 2 Masters, 2 WGCs, reached a career high of #2 in the world, and won all 12 of his career titles during this decade)
Honorable Mentions: Phil Mickelson, Henrik Stenson, Adam Scott, and Patrick Reed
In summary: Rory was the most dominant player in the first half of the 2010s (and overall), Spieth was the most domiannt player in the middle of the 2010s, and Brooks has been the most dominant player in the latter years of the 2010s. DJ was the most consistent, JT has the most left to give going forward and Tiger had the best redemption story.
Again, I'd love to hear everyone's opinions and personal lists!