The Zurich Classic added the No. 3-ranked player in the world to the 2018 list of competitors with a commitment from Jordan Spieth.
Spieth will pair for a second year in a row with fellow Texan Ryan Palmer. That duo finished fourth in the 2017 tournament.
"We welcome Jordan and Ryan back to our tournament," said Steve Worthy, CEO of the Fore!Kids Foundation, producer of the tournament.
Worthy said Spieth and Palmer attracted "huge galleries throughout the course" in 2017. Coming off a third-place finish last week at the Masters, Spieth should continue as a main attraction at the that runs from April 26-29 at TPC Louisiana.
Spieth at the Masters matched the all-time fourth round low score of 64.