Three players have finished their first rounds of the John Deere Classic with 65s, leaving them one shot off Ricky Barnes' lead.
Garrigus, who ranks 30th in the FedExCup standings, made three birdies on the front nine and finished strong with a birdie and an eagle at Nos. 16 and 17, respectively. He is coming off a tie for fourth at the AT&T National and has two runner-up finishes this year, as well.
Piercy, who won his first PGA TOUR event last year in Reno, has been solid this season with four top-20 finishes in his last eight starts. He posted four rounds in the 60s last week at The Greenbrier Classic.
Choi has won eight times on TOUR, most recently at THE PLAYERS last year. He tied for fifth at the season-opening Hyundai Tournament of Champions but hasn't finished in the top 10 since that event.