Brooks Koepka and Phil Mickelson committed to the Shriners Hospital for Children Open held in Las Vegas, the tournament announced Thursday.
World No. 1 Koepka played at TPC Summerlin from 2014-2017, which included a runner-up and T4 finish in addition to two missed cuts.
Mickelson hasn't played in Sin City since 2005 after making frequent appearances in the early portion of his career.
Adam Scott and defending champion Bryson DeChambeau already committed to the event, which starts Oct. 3.