Zalatoris He split with caddy Ryan Goble after the second round of the Wyndham Championship in Greensboro, North Carolina.
No public reason was given for the split. The two had been paired on the golf course for over three years.
Zalatoris, ranked 14th in the Official World Golf Ranking, carded two eagles to card a 4-under 66 on Friday at Sedgefield Country Club.
According to Golf Channel, Zalatoris is using one of his teachers, Josh Gregory, as a fill-in caddy. Zalatoris, 25, shot a 4-under 66 on Saturday and is 7-under 203 through three rounds.
Zalatoris has made three finals this season, including a No. 1 finish at the US Open. Matt Fitzpatrick In June.
Reuters contributed to this report.