Wins on the 8th and 9th holes put Harvey 1-up once more. Following a tie on the 10th Smalley would respond in a big way, as he won the 11th to tie the match, the 14th to take the lead for good and the 16th to create some breathing room. Smalley closed out the match one hole later.

“I played with Scott earlier this summer at the North Carolina Am, so I'm familiar with him,” said Smalley. “So, I knew it was going to be a tough day, and it was. I'm just glad I got out of there with the win.”

“It's basically another tournament, a brand-new tournament,” Smalley said. “It's a new day. Seeds don't really matter in match play. It was nice getting medalist. It was an honor, but I just had to start right all over again.”

As for Harvey, he admitted that the long playoff took a toll.

“I was OK for a couple holes, and then it's like, it just caught right back up to me,” said Harvey, 38, of Greensboro, N.C. “It's just the longest – one of the longest days on the golf course I've ever had.”

The biggest upset of the day according to seed was 62-seed David Boote defeating No. 3 Gavin Hall 3&2. Boote survived the morning playoff to reach the Round of 64 and he started quickly against Hall with a wins on the 3rd and 5th holes to grab a 2 up lead.

Hall, a senior at Texas, did win the 6th hole but that would be as close as he got.

Boote returned his lead to 2 up on No. 7 and then stretched his advantage to 4 up after wins on the 9th and 11th holes. The 2015 Welsh Amateur winner and Stanford star was then able to close the match out on the 16th green. He will now face No. 35 Ben Schlottman in the Round of 32.

In a battle of AmateurGolf.com members and Pac- 12 rivals eight-seed KK Limbhasut of California outlasted 57-seed, Stanford's, Franklin Huang. The match went back and forth all day long and it wasn't decided until Limbhasut took a 1 up lead on the 16th and then held on. Limbhasut will now face 40-seed Cristobal Del Solar.

14-seed Collin Morikawa joined Cal teammate Limbhasut in the Round of 32 with a 2&1 win over No. 51 Austin James. The AmateurGolf.com member turned an all-square match into a victory thanks to wins on the 16th and 17th holes. Tomorrow morning Morikawa will tussle with No. 19 Doug Ghim in a match that is certainly intriguing.

One of the more interesting matches to watch tomorrow features reigning British Amateur champion Scott Gregory and Michigan Wolverine Nick Carlson. Gregory, the nine-seed dominated his match 7&5 against No. 56 Raymond Knoll while Carlson won 2&1 over No. 24 Zach Foushee.

Some additional notable players to fall during the Round of 64 were Wake Forest's Will Zalatoris and St. Leo's Hugo Bernard. Zalatoris, the 27-seed, has won the Trans-Mississippi and Pacific Coast Amateur this summer but on Wednesday he fell to No. 38 Brad Dalke 1 up. Dalke who committed to Oklahoma as a 12-year- old won the match with a birdie on the closing hole.

Bernard drew very difficult match as he faced No. 17 Sam Horsfield and feel 3&1. Late in the spring Bernard won the NCAA Division II Individual title and recently he captured the Canadian Amateur. Horsfield came in playing well after recently blitzing the field to win the Western Amateur.

U.S. Amateur play will continue on Thursday with the Round of 32 in the morning and the Round of 16 in the afternoon.

Davis Riley, who held a 4-up lead through nine holes, endured a post-rain delay rally by Mathew Wolff, of Agoura Hills, Calif. Over a six-hole stretch, Wolff erased the deficit, and forced a sudden-death playoff, the only one of the day. Riley won the match with a par on the first extra hole.

“I've played a lot of match play and anything can happen,” said Riley, a University of Alabama sophomore who shot 63 on the North course Tuesday in stroke play to tie the course record. “You never have a match won, no matter how many up you are. So, I just told myself to stick to my routine.”

ADDITIONAL TOP 10 SEEDS RESULTS

-No. 2 Dawson Armstrong defeated No. 63 Bradley Moore (1 up)
-No. 61 Sahith Theegala defeated No. 4 Justin Suh (1 up)
-No. 59 Blair Hamilton defeated No. 6 John Oda (4&2)
-No. 7 Wyndham Clark defeated No. 58 William Gordon (3&2)
-No. 10 Luis Gagne defeated No. 55 Paul Pastore (5&3)

To view the full bracket click on the results link below.

-The USGA contributed to this story