Bo Jin’s tournament-best 64 Thursday vaulted him into the lead at the Asia-Pacific Amateur Championship.

The Oklahoma State sophomore carded seven birdies and zero bogeys at Dubai Creek Golf and Yacht Club in the United Arab Emirates to surge past a congested leaderboard and take the lead at the halfway point.

Jin sits at 8-under 134, a shot ahead of five players, including No. 1-ranked amateur Keita Nakajima. There are 13 players within three shots of the lead heading into the final two rounds. The winner of the AAC receives an invitation into next year’s Masters and Open Championship, provided he remains amateur.

“I’ve just got to keep playing my game and try to finish it off,” Jin said.

Jin came on strong at the end of the 2020-21 college season for Oklahoma State, when he posted three consecutive runners-up during the NCAA postseason. He has been unable to keep that pace this fall, however, and lately he’s struggled to consistently crack the starting five for the fifth-ranked Cowboys, including at last week’s East Lake Cup. Jin was on his game Thursday, making four birdies in a five-hole stretch on his back nine to surge into the lead.

Nakajima, who shared the first-round lead, went around without a bogey in the second round and sits one shot back, along with Baekjun Kim, Sam Chio, Connor McKinney and Wooyoung Cho. Yuxin Lin, the defending champion and two-time winner of the AAC, managed only an even-par 71 and dropped four shots behind.

Puwit Anupansuebsai matched Jin’s second-round 64 as the low round of the tournament, propelling him into a tie for 10th, three shots back.