VCU (23-10) was firmly in control for most of the second half before SFA (32-2) rallied in the closing seconds.
Haymon hit one of the biggest — and most improbable — shots of what’s already been a wild March, knocking down a 3-pointer and a free throw after being fouled by Jordan Burgess at the end of regulation.
Haymon hit another 3-pointer to put SFA up with 2 minutes left, but VCU had a final shot after Thomas Walkup missed 1 of 2 free throws with 14 seconds left. JeQuan Lewis got an open 3-pointer, but it went long and SFA snared the rebound.
Stanford 58, New Mexico 53: Chasson Randle scored 23 points and Stanford made an impression in its first NCAA appearance since 2008.
The 10th-seeded Cardinal (22-12) built an early 16-point lead then held on after No. 7 seed New Mexico rallied to tie it midway through the second half. They got four crucial free throws from reserve Robbie Lemons and Randle in the final half-minute after New Mexico had cut the deficit to two points.
Kansas 80, Eastern Kentucky 69: Andrew Wiggins scored 19 points, Jamari Traylor and Perry Ellis had double-doubles and second-seeded Kansas pulled away down the stretch to beat pesky Eastern Kentucky.
Traylor finished with 17 points and 14 rebounds, and Ellis had 14 points and 13 boards for the Jayhawks (25-9), who trailed 56-53 with 9 minutes to go before their game-ending charge.
Wichita St. 64, Cal Poly 37: Cleanthony Early had 23 points and unbeaten Wichita State faced no resistance from Cal Poly, going to 35-0 for the best start in NCAA history with a rout of Cal Poly.
The Shockers (35-0) dominated from the tip-off against the only team with a sub-.500 record in the tournament. With the exception of Early, most of the glaring numbers were on defense. The losers managed 13 points in the first half and shot 21 percent.
Tennessee 86, Massachusetts 67: Jarnell Stokes scored a career-high 26 points and grabbed 14 rebounds to lead Tennessee.
Jordan McRae added 21 points for the Volunteers (23-12), the No. 11 seed in the Midwest Regional. Tennessee had little trouble with the sixth-seeded Minutemen (24-9), shooting 54 percent from the field and handling UMass’ fullcourt pressure in a surprisingly one-sided performance that included another solid defensive showing.
Baylor 74, Nebraska 60: Cory Jefferson scored 16 points and sixth-seeded Baylor kept 11th-seeded Nebraska winless in its NCAA tournament history.
The Bears (25-11) have won 11 of 13 after a dismal start in the Big 12, recapturing the kind of momentum that vaulted the Bears to the Elite Eight in 2010 and 2012.
Creighton 76, Louisiana-Lafayette 66: Doug McDermott scored 30 points and third-seeded Creighton got three huge 3-pointers in the second half from Ethan Wragge to beat Louisiana-Lafayette.
McDermott had a double-double by halftime but went scoreless for nearly 14 minutes of the second half, leaving it to Wragge’s long shots to bail out the Bluejays from a potential upset by the Ragin’ Cajuns, who attacked Creighton (27-7) with fearless defense and rebounding.
Arizona 68, Weber St. 59: Nick Johnson scored 18 points and Aaron Gordon added 16 as top-seeded Arizona overcame a shaky start and a late run by Weber State.
Arizona (31-4) fell into an eight-point deficit in the opening minutes to give the 16th-seeded Wildcats hope of a monumental upset.
Gonzaga 85, Oklahoma St. 77: Kevin Pangos scored 26 points and Gary Bell Jr. added 17 for eighth-seeded Gonzaga, which beat Marcus Smart and ninth-seeded Oklahoma State.
The Bulldogs (29-6) are in their 16th straight NCAA tournament.
North Carolina 79, Providence 77: James Michael McAdoo sank two free throws in the final 3.5 seconds, and No. 6 seed North Carolina rallied to beat 11th-seeded Providence.
Providence’s Bryce Cotton scored a career-high 36 points and made one dazzling shot after another down the stretch. But he also fumbled a long rebound in the final moments, robbing the Friars of a chance for a last-second miracle.
Memphis 71, George Washington 66: Michael Dixon Jr. scored 19 points and hit four free throws in the final 10 seconds to help Memphis hold off George Washington in the second round of the East Regional.
Joe Jackson added 15 points for the eighth-seeded Tigers (24-9). They entered the tournament having lost three of five to fall out of the national rankings, and shot 49 percent in this one but struggled to put the ninth-seeded Colonials away until the final seconds.