Tony Benford's 10-foot base-line jump shot with three seconds left carried Texas Tech to a 64-63 Southwest Conference upset of No. 2 Southern Methodist last night before a sellout crowd of 8,174 at Lubbock (Tex.) Municipal Coliseum.

The loss almost certainly cost the Mustangs (15-2, 6-1 in the SWC) a shot at No. 1 in the news service rankings after top-ranked Georgetown fell to No. 3 St. John's earlier in the day.

Benford's shot came after the Red Raiders had blown an 11-point lead late in the second half, scoring only three baskets in the last six minutes.

Carl Wright led the comeback with a basket and four free throws as SMU took a 63-62 lead with 47 seconds to play.

After Benford's shot, the Mustangs threw the ball away but Tech's Vince Taylor missed a free throw. Larry Davis, who had 25 points for SMU, got the rebound. He hurled the ball the length of the floor, where it hit the glass, bouncing harmlessly away.

Bubba Jennings hit 13 of 15 shots for the Red Raiders (12-5, 5-2) to score a game-high 26 points.

SMU center Jon Koncak fouled out with 7: 34 left with 6 points.