“The first six holes were a grind,” said Uihlein. “On seven, when I made that putt, it felt big for me to have a putt go in and have it going the rest of the day.”

Uihlein will next face his 2010 USA World Amateur Team Championship teammate Scott Langley, of St. Louis, Mo. Langley, the 2010 NCAA champion while at the University of Illinois, eliminated Mitch Sutton, of Canada, 4 and 3.

In a meeting of 2011 USA Walker Cup teammates, Patrick Cantlay, 19, of Los Alamitos, Calif., defeated Russell Henley, 22, of Macon, Ga., in a hard-fought, 21-hole battle. Henley held the lead for the majority of the match, which was dormie with two holes to play. However, back-to-back birdies by Cantlay at 17 and 18 sent the match into extra holes.

The 19th hole provided perhaps the highlight of the championship thus far, with both players converting long eagle putts to extend the match. It was a moment that elicited a reaction from the normally stoic Cantlay.

“I let out a yell on one after I made my eagle and that’s probably the most excited I’ve ever been on the golf course in my life,” said Cantlay, an incoming sophomore at UCLA who received the 2011 Nicklaus Award as the NCAA Division I Player of the Year.

Cantlay ultimately won the match when Henley bogeyed the 21st hole. Henley, however, was not disappointed with his championship run.“I felt like I made a good run,” said Henley, a University of Georgia graduate who won the Nationwide Tour’s Stadion Classic at UGA in May. “I didn’t hand anything to anybody, and that’s what I’m proud of – never giving up.”

Patrick Rodgers, 19, of Avon, Ind., another member of the USA Walker Cup Team, advanced with a 6-and-4 victory over Jonathan Garrick, 17, of Atherton, Calif. The sixth USA Walker Cup player to advance to match play, 20-year-old Chris Williams from Moscow, Idaho, was defeated by Max Buckley, 21, of Rye, N.Y., 1 up.

Tom Lewis, 20, who held the first-round lead at the 2011 British Open Championship and finished as low amateur, and Jack Senior, 23, two Englishmen who will represent Great Britain and Ireland at next month’s Walker Cup Match, both advanced to the round of 16. Lewis defeated 2007 U.S. Junior Amateur champion Cory Whitsett, while Senior dispatched 2010 Junior Amateur runner-up Justin Thomas.

The first round of match play, which was delayed due to weather on Tuesday, was completed Thursday morning. The third and fourth rounds will be conducted Friday.

The 2011 U.S. Amateur Championship consists of 36 holes of stroke play followed by six rounds of match play, with the championship scheduled to conclude with a 36-hole final on Sunday.

The U.S. Amateur is one of 13 national championships conducted annually by the United States Golf Association, 10 of which are strictly for amateurs.

Erin, Wis. -- Results of the second round of match play at the 2011 U.S. Amateur Championship, played at 7,760-yard, par-72 Erin Hills.

Upper Bracket:

Bobby Leopold, Cranston, R.I. (142) d. Harris English, Thomasville, Ga. (142), 4 and 3Jordan Russell, College Station, Texas (140) d. Bryson Dechambeau, Clovis, Calif. (141), 5 and 3Peter Uihlein, Orlando, Fla. (137) d. Dylan Frittelli, South Africa (140), 5 and 4Scott Langley, St. Louis, Mo. (137) d. Mitch Sutton, Canada (140), 4 and 3John Peterson, Fort Worth, Texas (139) d. Stephan Jaeger, Germany (142), 1 upMax Buckley, Rye, N.Y. (141) d. Chris Williams, Moscow, Idaho (139), 1 upPatrick Cantlay, Los Alamitos, Calif. (140) d. Russell Henley, Macon, Ga. (135), 21 holesTom Lewis, England (139) d. Cory Whitsett, Houston, Texas (137), 19 holes

Lower Bracket:

Blake Biddle, St. Charles, Ill. (134) d. Peter Williamson, Hanover, N.H. (140), 2 upKelly Kraft, Denton, Texas (141) d. Andrew Putnam, University Place, Wash. (138), 3 and 2Patrick Rodgers, Avon, Ind. (136) d. Jonathan Garrick, Atherton, Calif. (139), 6 and 4Sunil Jung, Korea (137) d. Tim Madigan, Rio Rancho, N.M. (140), 5 and 4John Hahn, Las Vegas, Nev. (139) d. Beau Hossler, Mission Viejo, Calif. (135), 2 upJack Senior, England (140) d. Justin Thomas, Goshen, Ky. (138), 4 and 3Ben Geyer, Arbuckle, Calif. (135) d. Chase Wright, Muncie, Ind. (139), 4 and 3Jordan Spieth, Dallas, Texas (137) d. Lee Bedford, Cary, N.C. (140), 2 and 1

Pairings for Friday’s third round:

Upper Bracket7:30 a.m.: Bobby Leopold, Cranston, R.I. (142) v. Jordan Russell, College Station, Texas (140)7:40 a.m.: Peter Uihlein, Orlando, Fla. (137) v. Scott Langley, St. Louis, Mo. (137)7:50 a.m.: John Peterson, Fort Worth, Texas (139) d. Max Buckley, Rye, N.Y. (141)8 a.m.: Patrick Cantlay, Los Alamitos, Calif. (140) d. Tom Lewis, England (139)

Lower Bracket:

8:10 a.m.: Blake Biddle, St. Charles, Ill. (134) v. Kelly Kraft, Denton, Texas (141)8:20 a.m.: Patrick Rodgers, Avon, Ind. (136) v. Sunil Jung, Korea (137)8:30 a.m.: John Hahn, Las Vegas, Nev. (139) v. Jack Senior, England (140)8:40 a.m.: Ben Geyer, Arbuckle, Calif. (135) v. Jordan Spieth, Dallas, Texas (137)