World No. 4 Collin Morikawa has split with J.J. Jakovac, his only caddie since turning professional in 2019 and winning six times on the PGA Tour, including two majors.

Jakovac confirmed the news, which was first reported Tuesday by SiriusXM PGA Tour Radio, in a text message to Golfweek.

Morikawa, 28, has already found a replacement, veteran caddie Joe Greiner, according to reports. Greiner became available after choosing to part ways with close friend Max Homa in early April. Morikawa’s next event is the Truist Championship from May 8-11 in Philadelphia.

Greiner filled in for Justin Thomas’ injured caddie Matt “Rev” Minister at the Masters and at the RBC Heritage, which Thomas won for his first tour victory in nearly three seasons. Thomas, No. 5 in the Official World Golf Ranking, said the arrangement was temporary until Minister recovered from his ailing back.

Morikawa’s six years with Jakovac included victories at the 2020 PGA Championship and the 2021 Open Championship. Morikawa last won at the Zozo Championship in October 2023.

He has finished second twice in eight events this year (The Sentry in January, the Arnold Palmer Invitational in March). For his career, Morikawa has 11 runner-up finishes, two thirds, 29 top-fives and 44 top-10 placings while making 109 of 129 cuts.

Morikawa and teammate Kurt Kitayama missed the cut last weekend at the Zurich Classic of New Orleans.