Fitch nailed four 3-pointers in the second half and finished with 16 points to lead the 10th-ranked Wildcats to a 67-51 Southeastern Conference victory over Auburn, which had a nine-game winning streak snapped.
Kentucky (14-3, 4-0 SEC East) has won eight straight and 17 of the last 18 meetings with Auburn. Fitch scored 15 points in the second half and his shooting sparked a late run.
"You have to give credit to Fitch," Auburn coach Cliff Ellis said. "He made key plays and I thought he was the major difference in the game; his shots were big."
Auburn (15-3, 4-1 West) took its last lead at 38-37 on a 3-pointer by Marquis Daniels with 12:21 remaining. The Tigers still were within 42-40 after Marco Killingsworth drained a pair at the line just before the midway point of the half.
But Fitch scored eight points to fuel a 13-0 spurt, triggering it with a 3-pointer. Keith Bogans muscled inside for a three-point play to cap it for a 55-40 advantage with 6:29 to play.
"I struggled in the first half and I was critical of myself, and that made me force my shot," Fitch said. "In the second half, I just tried to stay positive and do what I know I can and I got my confidence back."
Bogans and Jules Camara each netted 13 points and Cliff Hawkins added 10 off the bench for Kentucky, which shot 50 percent (12-of-24) in the second half. The Wildcats made nine 3-pointers while the Tigers shot just 2-of-14 from beyond the arc.
Killingsworth led all scorers with 19 points for the Tigers, who fell to 2-40 against the Wildcats in Lexington.
Auburn committed a season-high 26 turnovers, including seven by Daniels. The Wildcats converted the miscues into 29 points.
"I thought we played excellent defense for the most part," Kentucky coach Tubby Smith said. "I thought we really put focus in after a sluggish start, a lot of which had to do with Auburn."
"Kentucky has a great club," Daniels said. "They did a good job with their defensive rotations and forced us into some turnovers where we were trying to go 1-on-1 and didn't take care of the ball."
The Tigers' defense was strong early as Brandon Robinson's basket gave Auburn a 12-5 lead nearly seven minutes into the contest. But the Tigers went into a drought of more than 10 minutes without a basket as Kentucky closed on an 11-2 run for a 29-22 halftime lead.
Daniels' 3-pointer provided the final lead of the night for the Tigers at 38-37 with 12:21 remaining. Kentucky's Erik Daniels scored on a layup and Hawkins drilled a 3-pointer for a 42-38 edge with just under 11 minutes to play.
Auburn had just six baskets in the first half and shot 38 percent (16-of-42) for the game. Marquis Daniels managed only 11 points on 5-of-14 shooting while being defended by Chuck Hayes.
"We gave (Marquis Daniels) different looks, different physiques," Smith said. "Chuck is our most versatile defender because he can go out on the perimeter and go inside to guard post players."
It was the fourth straight game in which Kentucky held an opponent to below 40 percent shooting.
Auburn, which was held to the lowest point total by a Kentucky opponent this season, lost their ninth straight visit to Rupp Arena.
"I thought it was a ballgame in which both teams took a lot of pride in their defense," Ellis said. "I think both teams' strongest asset is how well and how hard we play on defense."