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Truckee, CA (Sports Network) - Stroke-play medalist Jim Liu birdied the 19th hole on Wednesday to earn a 1-up win at the U.S. Junior Amateur Championship.

Liu's match with Matthew Lowe went an extra hole, and neither player led by more than a 1-up margin. Lowe bogeyed the first to dip 1-down, but came back with a birdie on the third to square the match.

Lowe won the sixth when Liu made a mess of the hole, but Lowe stumbled to a double-bogey at the ninth to square the match at the turn. Liu birdied the par-5 10th, but lost the 12th.

Liu double-bogeyed No. 13 to dip 1-down for the last time. Liu made par at the 15th to square the match and followed with a birdie on 16 to go 1-up. A bogey by Liu at 18 forced overtime, but he birdied the first extra holes to advance.

"You can't expect to play well every day. It's about the days where you don't have your best game and you just grind it out," said Liu. "I just tried to stay patient out there. As long as you have more holes to play you have a shot. That's the mindset I had."

Nick Heinen, Corey Eddings and Zachary Bauchou all earned 1-up wins themselves, while Jooho Lee and Aaron Terrazas needed 20 holes to advance.

Sean Crocker and Scottie Scheffler both earned 7 & 5 wins, while Sam Horsfield ousted Dean Sakata, 7 & 6.

The second and third round will take place on Thursday, while the quarterfinals and semifinals are slate for Friday. The 36-hole championship match will take place on Saturday.