The Sooners (11-2) didn't lead in the final 7:30 of regulation and hadn't even been tied since just under seven minutes remained before Clark's desperation shot went in.
“It was definitely deflating to say the least,” Louisiana coach Michael White said. “I thought the game was over.
“As deflated as I was, I can't imagine how deflated our guys were. To regroup and play with the amount of mental toughness as they did in the extra period was really impressive.”
OU fell behind early in overtime before taking a four-point lead. But Louisiana Tech controlled things from there, finishing the game with a 10-3 stretch to win.
Although the Sooners had chances in the final minute of overtime, it was the stretches earlier in the game — a 16-3 Louisiana Tech run to end the first half and an 18-6 stretch late in the second half — that ultimately cost OU a chance at an eighth consecutive win.
“This is a big loss, but I think it'll be a great learning experience for us,” Clark said. “This loss can teach us a lot of things. We're just going to get back in the gym and work on things — like defense and just being tougher.”