Top Big 12 players: Nos. 1-5

Oklahoma quarterback Baker Mayfield was the Big 12's best player this season. Wade Payne/AP

This week, we've been ranking the top 25 players in the Big 12 for the 2015 season.

We complete the countdown below with our top five players:

1. Baker Mayfield, QB, Oklahoma: The walk-on transfer completely transformed the mindset of the Sooners with a brash demeanor and unbridled confidence. Mayfield's season, which included a fourth-place finish in the Heisman voting, featured several signature moments, including the fourth-quarter comeback at Tennessee, the freestyle scramble and game-sealing touchdown pass at Baylor, and the block that sprung Joe Mixon's rout-inducing touchdown run at Oklahoma State. Statistically, Mayfield was terrific, leading the Big 12 with a completion rate of 68.1 percent, to go along with 3,700 passing yards, 36 touchdown passes and just seven picks. But the way Mayfield galvanized his team to the Big 12 title and a berth in the College Football Playoff is what ultimately vaults him to this top spot.

2. Corey Coleman, WR, Baylor: Boasting an enviable blend of strength, speed and hands, Coleman feasted on opposing defenses in his final college season. The Biletnikoff Award winner topped the Big 12 with 1,363 receiving yards on 74 catches. He also led the country with 20 touchdown receptions, despite going scoreless after Nov. 5, due mostly to the rash of injuries Baylor's quarterbacks suffered. From Kendall Wright to Antwan Goodley, Baylor has enjoyed a series of big-time receivers under coach Art Briles. Coleman, however, ranks at the top.

3. Emmanuel Ogbah, DE, Oklahoma State: The Big 12 sack champion finished the season with 13 sacks, which was tied for second nationally and was 3 1/2 more than any other defender in the conference. Ogbah was relentless coming off the edge all season, impacting games even when he didn't get to the quarterback by forcing hurried and errant throws. And whenever the Cowboys needed a big defensive play, the ESPN.com Big 12 Defensive Player of the Year often delivered, which is a big reason why Oklahoma State came through in so many close games.

4. Andrew Billings, DT, Baylor: Billings led the Bears with 5 1/2 sacks, but the numbers hardly do his dominance justice. Usually unblockable without a double-team, the former Texas high school state weightlifting champion was the primary force behind Briles' best defense at Baylor. After recovering from a midseason ankle injury, Billings came back to tally six tackles for loss in Baylor's final four regular-season games, including 2 1/2 in the Bears' resounding victory at Oklahoma State. Billings figures to go down as one of the most imposing defensive players ever to come through Baylor.

5. Trevone Boykin, QB, TCU: Had he stayed healthy, Boykin might well have topped this list. Alas, an ankle injury that knocked him out of two games followed by a stunning arrest that led to his suspension in the Valero Alamo Bowl dropped Boykin here. But through the first two months of the season, there wasn't a better player in college football than Boykin. Going into November, he had accounted for 34 touchdowns while leading the Horned Frogs to final-minute wins over Texas Tech and Kansas State. After the ankle injury, Boykin also came back to toss a game-winning touchdown in the overtime victory over Baylor. Though his college career ended in a sad way, Boykin was still a transformational player for the Horned Frogs, who since joining the conference have emerged as a Big 12 power.