Fayetteville, AR (SportsNetwork.com) - Keith Hornsby hit a 3-pointer at the buzzer to send LSU to an 81-78 win over No. 18 Arkansas on Saturday.

Before Hornsby hit the winning shot, LSU's Jarell Martin had a key block at the other end to keep the game tied. Josh Gray then penetrated and kicked out to Hornsby in the corner for the winning jumper.

"They're a good basketball team," said Arkansas coach Mike Anderson. "They made shots, and they made plays when they needed to."

Martin led all scorers with 27 points for the Tigers (22-9, 11-7 SEC). Jalyn Patterson scored 20 while hitting six 3-pointers and Gray had 10 points and six assists.

Bobby Portis led Arkansas (24-7, 13-5) with 21 points and 15 rebounds.

The buzzer-beater spoiled Senior Day for the Razorbacks. The team's two seniors, Rashad Madden and Alandise Harris, scored 12 and 10 points, respectively.

An 8-0 run for Arkansas late in the second half gave them a 73-70 lead. Tim Quarterman briefly tied the game with a 3-pointer, but Anthlon Bell answered with one at the other end to restore the Razorbacks' lead with 2:16 left.

Harris' free throws with 1:17 remaining put Arkansas ahead 78-75, but it would not score again. Patterson's 3 tied the game before Martin's block started the winning sequence.

The Tigers used a 14-0 run in the first half to build an early 27-15 lead. Aaron Epps scored the last five points with a 3 and layup on back-to-back possessions.

Portis' 3-point play on the ensuing possession ended the LSU surge and a Razorbacks' scoring drought that lasted nearly six minutes.

Arkansas pulled within one late in the half, but the Tigers led 41-35 at the break after finishing the period on an 8-3 spurt.

Game Notes

LSU forward Jordan Mickey, averaging 16 points per game, missed the contest with an arm injury ... Arkansas' Michael Qualls scored 15 points to reach 1,000 for his career ... Bell scored 14 points and shot 4-of-11 from 3-point range ... The SEC Tournament starts March 11 in Nashville.