Dustin Johnson
DJ put together a solid major season beginning with the Masters, where he finished T-2 at 12-under. He followed that with a solo-second place finish at the PGA Championship before faltering (by his standards) to T-35 and T-51 finishes at the U.S. and British Opens, respectively.
Cumulative major score: 14-under

Dustin Johnson during the third round of the 2019 U.S. Open at Pebble Beach Golf Links. (Kyle Terada/USA TODAY Sports)