You've seen his coolness in the clutch.

His 69-yard fourth-quarter touchdown gallop against Kansas State. His 55-yard touchdown connection with Josh Doctson on the next possession against the Wildcats. His calm demeanor during TCU's game-winning drive against Texas Tech, which ended with Aaron Green's improbable four-yard catch off Doctson’s defection.

Time and time again, Trevone Boykin has stepped up in critical moments for TCU this season.

The Heisman Trophy candidate has been the Big 12’s best player this season, but it has been his play in clutch moments that really separates TCU’s star quarterback from the pack and could carry the Horned Frogs to a Big 12 title. Though other players shrink in those clutch moments, Boykin excels.

"He’s let the game come to him and not try to force it," Horned Frogs coach Gary Patterson said. "You get down in the red zone if you’re not careful, you force it. He’s done a good job not doing that and being able to beat people with his feet."

On third-down plays -- in the red zone and the fourth quarter -- have been when Boykin is at his best. With the help of ESPN Stats and Information, here’s a look at his numbers during those key moments as he has helped carry the Horned Frogs to a 8-0 start:

In the fourth quarter, Boykin is 23 of 31 for 340 yards and four touchdowns, 10.97 yards per attempt and 10.75 yards per dropback. He’s added 17 carries for 177 yards (10.41 yards per carry) and three touchdowns with 52.9 percent of the carries going for five yards or more and six runs of 10 yards or more. His 98.9 fourth-quarter QBR leads all Power 5 quarterbacks.

In the red zone, Boykin is 29 of 41 for 246 yards, including 16 touchdown passes without an interception. He’s added 15 carries for 78 yards and five touchdowns. His 96.5 QBR in the red zone is third among Power 5 quarterbacks.

On third-down plays, Boykin is 35 of 59 for 560 yards, with four touchdown passes, one interception, 9.49 yards per attempt and 9.22 yards per dropback. He’s added 26 carries for 131 yards, (5.0 yards per carry) and two touchdowns. Only Texas Tech’s Patrick Mahomes (97.8) has a better QBR on third down among Power 5 quarterbacks.

"If there’s a more dynamic player in college football I don’t know where he’s at, maybe at LSU (Leonard Fournette)," Oklahoma State coach Mike Gundy said.

Boykin’s excellence has helped TCU rank among the nation’s top second-half teams. The Horned Frogs have outscored opponents by an average of 12.8 points per game, seventh among FBS teams, and their 23 points per game average in the second half, is second in FBS.

All these traits have helped TCU overcome a season full of injuries, suspensions and inexperience on the defensive side of the ball. Now, with its title hopes at stake every weekend during November, Patterson and the Horned Frogs have the peace of mind that comes with having a veteran quarterback who can take over close games down the stretch.

"He creates a lot of issues," said Oklahoma State defensive coordinator Glenn Spencer, whose defense will try to corral Boykin in a battle of unbeatens on Saturday. "Even when it's not there, he'll create something for himself. I don't have the answer on how to slow him down yet, and who knows if we'll have it on Saturday? We're going to do some things to hopefully slow him down a little bit, but guys like him have great games and we just have to make timely stops throughout the night and affect him."