University of Texas signee Doug Ghim ousted defending champion Jordan Niebrugge in a 23-hole marathon at the U.S. Amateur Public Links at Sand Creek Station Golf Course in Newton, Kan.
Ghim, of Arlington Heights, Ill., birdied five of the first seven holes to take a 4-up lead. But it took Niebrugge just five more holes to square the match.
Niebrugge sank a 10-foot par putt on the 18th hole to extend the match. The players halved the first four playoff holes with pars, then Ghim won on the 23rd hole with a par to Niebrugge's bogey.
In Friday's quarterfinals, Ghim will face John Oda of Hawaii. The other quarterfinal matches will pit local favorite vs. Michael Gellerman of Sterling, Kan., against Robert Geibel of Pembroke Pines, Fla.; Rico Hoey of Rancho Cucamonga, Calif. vs. Jess Bonneau of Houston; and Byron Meth of San Diego vs. Bryson Dechambeau of Clovis, Calif.