Danny Lee was so dominant that his day ended early at the U.S. Amateur. Derek Fathauer had to work overtime twice just to get back into the quarterfinals.

And despite battling for 23 holes, Brandon Detweiler of Akron saw his spirited run through the brackets come to an end at Pinehurst No. 2, where he lost to Patrick Reed of Augusta, Ga. in the round of 16.

Lee, the world's top-ranked amateur at 18, cruised past both of his opponents in match play Thursday and moved within three wins of supplanting Tiger Woods as the youngest champion in Amateur history. He dominated Clemson freshman Jacob Burger 5 and 4 in the second round, then defeated Wichita State's Connor McHenry 7 and 6 in the round of 16.

Meanwhile, Fathauer needed extra holes in both of his matches, including 22 to outlast Kevin Tway. He sank a 20-foot birdie putt on the fourth hole to advance to the quarterfinals for the second straight year.

"(I) just had a pretty good read on it, so I had nothing to lose," Fathauer said, calling it "a perfect putt."

Also advancing were Drew Kittleson, Morgan Hoffman, Adam Mitchell, Charlie Holland and Graham Hill.

The semifinals are Saturday, with the winners squaring off in a 36-hole final on Sunday at the par-70 course.

In Thursday's afternoon round, Detweiler and Reed were the last match on the course and one of three matches to go at least 22-holes. Detweiler took advantage of a pair of bogeys by Reed on the 469-yard, par-4 second and 336-yard, par-4 third holes to go 2-up. Reed quickly gained a hole back with a birdie on the 565-yard, par-5 fourth.

Detweiler held the 1-up advantage through before he bogeyed the 467-yards, par-4 eighth hole. Reed lead 1-up through most of the back nine but he made a bogey on the 442-yard, par-4 18th hole to send the match to extra holes.

Detweiler and Reed matched each other on the first four extra holes, until Reed made par and Detweiler made bogey on the fifth to close out the match.

In Thursday's morning round, the 19th-seeded Detweiler trailed from the outset of his match with 14th-seeded Brian Harman. Harman birdied the 565-yard, par-5 fourth hole to go 1-up and went 2-up after a Detweiler bogey on the 404-yard, par-4 seventh hole.

Detweiler birdied the par-3 ninth to cut Harman's advantage to 1-up. A Detweiler par and Harman bogey on No. 14 squared the match.

Harman's par at the par-3 15th put back on top with three holes to play.

Detweiler closed with a rally that included a match-squaring birdie on the 190-yard, par-3 17th, before his par at the 442-yard, par-4 18th gave him a 1-up victory.

Detweiler, a Veritas Academy graduate, is a 21-year-old redshirt sophomore on the golf team at North Carolina State University.