Tre Johnson poured in a career-high 32 points, including eight in the final 3 1/2 minutes, as Texas roared back to upset No. 15 Kentucky 82-78 on Saturday in a key Southeastern Conference game in Austin, Texas.The Longhorns (16-10, 5-8 SEC) trailed by four at halftime and by 69-64 after a layup by Kentucky’s Amari Williams with 3:51 to play. Texas leapfrogged to the front for good via a 14-1 run that featured a three-point play by Johnson, four points from Tramon Mark, a putback dunk by Kadin Shedrick and culminated with a jumper and a pair of free throws by Johnson, the Longhorns’ freshman phenom.Johnson also grabbed a team-high nine rebounds, and Mark scored 26 as the Longhorns snapped a three-game losing streak. Texas played without Arthur Kaluma, its second-leading scorer and top rebounder.Otega Oweh led Kentucky with 20 points while Williams added 18 and 12 rebounds and Ansley Almonor had 11 points. The Wildcats (17-8, 6-6), who were missing second-leading scorer Jaxson Robinson and Lamont Butler due to injuries, had a two-game winning streak snapped.The Wildcats led by as many as seven early on before Texas rallied to tie the game at 15-all on a 3-pointer by Jordan Pope at the 11:55 mark. Five consecutive points by Mark propelled the Longhorns to the front at 20-17 with 10:35 to play, and Texas pushed its lead to five on a layup by Johnson with 8:50 left until halftime.