The Sooners (14-4) finished a tough stretch to open Big 12 play over .500, going 3-2 including a pair of wins over teams ranked in the top 12.
“We were talking about it ever since last week when we lost to Kansas State,” Clark said. “We instilled in our head this was a must-win game for us. We need to start out with great energy, which I think we did.”
After struggling from the floor in the first half, making just 7 of 30 shots from the field before the break, the Sooners came out on fire, helped by three consecutive 3-pointers by Clark, Buddy Hield and Isaiah Cousins.
Clark and Hield, the Sooners' top two scorers, were just 6 of 25 from the field in Tuesday's loss at Kansas State.
Hield missed his first four shots Saturday and was scoreless nearly four minutes into the second half before going 7 of 10 down the stretch to lead the Sooners with 19 points.
Clark and Hield combined to go 12 of 23 from the field against Baylor, hitting five 3-pointers.
“It's trust,” Hield said. “My coaches were confident in me and told me I needed to make shots. My teammates found me in good scoring spots and I was able to fill it up.”
Clark added 14, and Ryan Spangler had seven points and nine rebounds. Freshman point guard Jordan Woodard had eight assists and just two turnovers.
OU hosts TCU at 8 p.m. Wednesday (ESPNU).