Dominique Kirk made one of two free throws to bring Texas A&M within 55-53 with just over than a minute to play.
Derrick Roland stole the ball from Eaton with less than a minute to play and Donald Sloan looked like he was on the way to an easy layup before Terrel Harris came from behind for the block. Obi Muonelo made two free throws after the Aggies were forced to foul to make it 57-53 with 16 seconds left.
Sloan made the second of two free throws with 11 seconds left to cut Oklahoma State's lead to 57-54, before Eaton ensured the win with his free throws.
Oklahoma State overcame a three-point deficit with an 8-4 run fueled by five points by Eaton to go up 53-50 with about 5 minutes left. Eaton had a 3-pointer and the 5-foot-11 point guard drove around A&M's big men for an easy layup in that span.
The Aggies got within one on a dunk by Bryan Davis with less than 3 minutes remaining, but the Cowboys answered with a jump shot by Harris seconds later that made it 55-52.
The Cowboys opened the second half with a 7-1 run capped by a 3-pointer by Muonelo to take a 41-37 lead. Texas A&M's problems early in the second half came mostly from poor rebounding and several mishandled passes in the post.
DeAndre Jordan, who led A&M with 15 points, then made his first appearance in the second half and provided a spark by scoring Texas A&M's next four points.
The Aggies regained the lead about 2 minutes later on a 3-pointer by Sloan that made it 46-45.
Texas A&M led by as many as nine points midway through the first half, but Oklahoma State went on a 12-4 run to tie it at 28-all on a 3-pointer by Muonelo about 4 minutes before halftime. The Aggies led 36-34 at halftime.
Muonelo added 15 points and seven rebounds for the Cowboys.
The game was played in front of a record crowd of 13,584, including former Texas A&M All-America Acie Law IV. Law, who plays for the Atlanta Hawks, was honored in a halftime ceremony in which a banner of his jersey was raised to the rafters of Reed Arena. It was the first time Texas A&M honored a player that way.
- Send us your sports story tips
- Click here for more sports stories
