Saturday delivered the kind of early-season chaos that can reshape an entire College Football Playoff race. Texas erased a 20-point deficit to beat No. 1 Ohio State, Oklahoma State pulled off a stunning upset of No. 6 Oregon, Michigan bounced back by knocking off No. 11 Oklahoma, and Iowa reclaimed control of the Cy-Hawk rivalry.

No. 4 Texas 24, No. 1 Ohio State 23

The game of the day became an instant classic in Austin. Ohio State controlled almost everything for three quarters, taking a 23-3 lead behind Julian Sayin, Jeremiah Smith and another strong defensive performance. Sayin finished with 278 passing yards, while Smith caught eight passes for 164 yards and a touchdown.

Then Texas completely flipped the game.

Arch Manning directed three fourth-quarter touchdown drives as the Longhorns scored 21 unanswered points. Manning connected with Ryan Wingo for the first score before Hollywood Smothers punched in two 1-yard touchdowns. The second came with 30 seconds remaining, and Gianni Spetic's extra point gave Texas its first lead of the night, 24-23.

Ohio State still had one final opportunity, but Graceson Littleton intercepted Sayin on the last play to complete one of the biggest comebacks in Texas history. The Longhorns avenged consecutive losses to Ohio State and made an immediate case to become the nation's new No. 1 team.

Oklahoma State 39, No. 6 Oregon 31

If Texas provided the most dramatic comeback, Oklahoma State delivered the biggest upset. A year after being humiliated 69-3 by Oregon, the Cowboys stunned the Ducks in Stillwater.

Quarterback Drew Mestemaker was sensational, throwing for 317 yards and two touchdowns while rushing for another 109 yards and a score. Oklahoma State piled up 554 total yards against an Oregon defense that had already shown vulnerabilities against Boise State.

Oregon briefly tied the game at 30 early in the fourth quarter, but Mestemaker answered with a touchdown run and the Cowboys never surrendered the lead again. Oklahoma State entered the afternoon carrying a 21-game losing streak against FBS opponents. Ending it against the No. 6 team in America made this one of college football's most improbable early-season results.

No. 21 Iowa 16, Iowa State 13

The Cy-Hawk rivalry produced exactly the kind of game its reputation suggests: low-scoring, physical and decided by special teams.

Iowa State led 13-10 entering the fourth quarter, but Caden Buhr tied the game with a 32-yard field goal and then drilled a 42-yarder with 19 seconds remaining to give Iowa the victory. Neither team committed a turnover, and the Hawkeyes finished with only a 284-255 advantage in total offense.

For Iowa, the victory was especially satisfying after Iowa State had won the previous two meetings.

No. 10 Texas A&M 48, Arizona State 20

The final score makes this look like an offensive demolition, but the real story was Texas A&M's defense.

Arizona State actually outgained the Aggies 369-255, but committed four turnovers. Texas A&M turned those mistakes into a landslide, including two fourth-quarter interception returns for touchdowns. Marco Jones and Julian Humphrey both took interceptions to the end zone as the Aggies scored 24 unanswered points in the final period.

Marcel Reed threw three touchdowns, while Arizona State receiver Reed Harris was outstanding in defeat with nine catches for 189 yards and two scores. The difference was simple: A&M repeatedly turned Arizona State mistakes directly into points.

Michigan 17, No. 11 Oklahoma 10

After needing a miracle to escape Western Michigan a week earlier, Michigan produced a much more encouraging performance against a ranked Oklahoma team.

Freshman quarterback Bryce Underwood did most of his damage with his legs, rushing for 87 yards and breaking a 38-yard touchdown run in the first quarter. Oklahoma eventually fought back to tie the game 10-10, but Jordan Marshall's 1-yard touchdown with 8:01 remaining restored Michigan's seven-point advantage.

The Wolverines' defense finished the job, forcing two Oklahoma turnovers and sacking John Mateer on the Sooners' final possession. It wasn't pretty, but beating No. 11 Oklahoma represented a major response after Michigan's shaky opener.

No. 15 BYU 28, Arizona 17

Arizona actually took a 17-14 halftime lead in Provo before BYU's defense took over the game.

The Cougars shut Arizona out after halftime and allowed only 87 second-half yards. Quarterback Bear Bachmeier threw for 217 yards and three touchdowns while also rushing for a score. Kyler Kasper caught two touchdown passes, including the fourth-quarter score that stretched BYU's advantage to 28-17.

BYU improved to 2-0 while playing turnover-free football for the second consecutive week.

Mississippi State 38, Minnesota 13

Mississippi State may have delivered Saturday's most overlooked statement.

The Bulldogs marched into Minneapolis and scored touchdowns on four consecutive first-half possessions, building a 28-6 halftime lead. Quarterback Kamario Taylor was the difference-maker, completing 16 of 22 passes for 227 yards and three touchdowns while adding 86 rushing yards.

Running back Fluff Bothwell contributed 113 yards and two touchdowns as Mississippi State amassed 479 yards of offense. Minnesota's only touchdown came on a defensive fumble recovery, while the Gophers' offense struggled to run the football and committed 12 penalties for 115 yards.

By night's end, the national picture looked dramatically different. Texas had taken down No. 1, Oregon's championship aspirations had suffered a major blow, Michigan had gone from nearly losing to Western Michigan to beating a ranked Oklahoma team, and Oklahoma State suddenly owned one of the season's signature victories. Week 2 provided an early reminder that preseason rankings rarely survive September intact.