who finished with five 3s, made a 3-pointer for LSU to get the Tigers (10-4, 1-1 Southeastern Conference) within two with 12 seconds left.
Davis missed two free throws on the other end before Waters launched his winner under heavy defensive pressure to give the Tigers the win.
Leading scorer D.J. Hogg returned for the Aggies (11-4, 0-3) after a suspension, but it wasn't enough to stop them from dropping their third straight after lopsided losses to Alabama and Florida.
Hogg was back after missing three games for an unspecified violation of team rules. But the Aggies still weren't at full strength with starters Admon Gilder and Duane Wilson out with knee injuries and Robert Williams, who is projected to be an NBA lottery pick, out with an illness.
Davis led the Aggies with 19 points and 12 rebounds, and Hogg added 12 points with six rebounds.
A 7-2 spurt by LSU had the game tied with about four minutes left before Tonny Trocha-Morelos put the Aggies on top 60-57. But the lead was short-lived as Waters hit a 3 for the Tigers a few seconds later to tie it again.
LSU scored seven straight points, with a 3-pointer from Daryl Edwards, to take a 50-48 lead midway through the second half.
NO. 19 CINCINNATI 76, SMU 56
HIGHLAND HEIGHTS, Ky. (AP) — Jacob Evans III scored 18 points, and Gary Clark had a big second half as No. 19 Cincinnati pulled away to a 76-56 victory over SMU on Sunday, extending the longest active home-court winning streak in the country.
The game matched the American Athletic Conference's top defensive teams, and it showed in the first half as they went a combined 15-for-52 from the field and the Bearcats led 34-20.
Cincinnati (14-2, 3-0) broke it open with a 12-point run late in the first half featuring Evans' 3-pointer. Clark scored 13 of his 18 points in the second half as the Bearcats finally got the ball inside and pushed the lead to 20.
SMU (12-5, 2-2) shot only 35.7 percent from the field and had 18 turnovers that set up 26 of Cincinnati's points. Jarrey Foster led the Mustangs with 16 points.
The Bearcats have won 35 straight home games on two courts. They've gone 9-0 while playing this season at BB&T Arena at Northern Kentucky University while their on-campus arena is renovated. They went 18-0 at Fifth Third Arena last season.