All three golfers birdied the final hole in the first round. Mark O'Meara, who had seven birdies on the day, is at 5-under 67 and five golfers are tied at 4-under.
Calcavecchia had eight birdies and two bogeys. He was 3-under after four holes but slipped back with bogeys at Nos. 6 and 8. He had five birdies in his final 10 holes.
Allen played the back nine of the Jack Nicklaus Golf Club Korea course first and was 1-under after eight holes. He was 5-under over the next four holes, however, capping the run with an eagle at the 550-yard par-5 third hole. His lone bogey came at No. 7 but he closed with a birdie at the ninth.
Peoples also overcame a front-side bogey, going 5-under in his last eight holes. That spurt included an eagle at the par-5, 528-yard 15th.