Arkansas scored on its first three possessions in building a 7-2 lead.
Kentucky came back with a 9-0 run to go ahead 11-7.
Trailing 13-11, Arkansas went on a 15-2 run for a 26-15 Razorback advantage.
The Hogs led by as many as 12 on two occasions and went to halftime up 37-30.
Trailing 50-43, UK went on a 14-2 run. The 57-52 lead was UK’s largest of the game.
Arkansas rallied back to tie the back at 60 on a pair of foul shots by Rashad Madden with 29 seconds remaining.
The score remained tied at 60 as Andrew Harrison’s short jumper was blocked by Coty Clarke and Arkansas’ Alandise Harris missed a 3-point heave at the buzzer.
Clarke got the first score of overtime on a 3-pointer at 3:28 and Arkansas led the rest of the way.
The last time Kentucky played back-to-back overtime games was Dec. 9 and 16, 1978 when the Wildcats beat Kansas at home, 67-66, then lost at Indiana, 68-67.
The last time Kentucky played two overtime games against the same opponent in the same season was in 2010 when the Wildcats defeated Mississippi State twice, 81-75 at Starkville and 75-74 at the SEC Tournament in Nashville.
Willie Cauley-Stein and Julius Randle each had a double-double tonight. The last time two Cats had double-doubles in the same game was against Texas-Arlington on Nov. 19.
Kentucky was strong around the basket today.
UK won the rebounding 47-38, including a season-high 26 offensive rebounds.
UK won points in the paint 42-20 and second-chance points 19-11.
Willie Cauley-Stein totaled 16 points and 13 rebounds, his third double-double of the season and seventh of his career.
The 13 rebounds tied his career high set earlier this season vs. Robert Morris.
Julius Randle got 14 points and 10 rebounds, his 15th double-double of the season.
James Young tallied 11 points, the 10th time in last 11 games he has scored in double figures.