Houston Texans running back Devin Singletary celebrates after scoring against the Cleveland Browns during their AFC wild-card playoff game Saturday in Houston. The Texans won, 45-14. David J. Phillip/Associated Press

HOUSTON — Rookie C.J. Stroud became the youngest quarterback to win a playoff game, throwing for 274 yards and three touchdowns, and the Houston Texans returned two interceptions by Joe Flacco for scores in a 45-14 rout of the Cleveland Browns in an AFC wild-card matchup Saturday.

Stroud, the second overall pick in the draft last April, is also the highest-drafted rookie QB to win in the postseason. He picked apart Cleveland’s vaunted defense, throwing touchdown passes of 15, 76 and 37 yards

At 22 years and 102 days old, he passed Michael Vick, who was 22 years, 192 days old in 2002 when his Falcons beat the Packers.

Stroud threw for 236 yards and three touchdowns before halftime as the Texans built a 24-14 lead. The defense took over after that, with Steven Nelson and Christian Harris returning interceptions for touchdowns on consecutive drives in the third quarter to extend the lead to 38-14.

With the Texans up 45-14 with nine minutes to go, Stroud’s work was done, and he was replaced by Davis Mills.

Houston was back in the playoffs for the first time since the 2019 season. Stroud’s stellar play and the leadership of first-year coach DeMeco Ryans transformed the Texans (11-7) from NFL laughingstock to AFC South champions.

Flacco, who turns 39 in three days, came off the couch to go 4-1 as a starter at the end of the regular season, leading the Browns (11-7) to just their third playoff appearance since their 1999 expansion rebirth, but second in four seasons under Coach Kevin Stefanski.

Playing in his 17th postseason game but first in nine years, Flacco couldn’t continue his magical run under the bright lights of the playoffs.

Flacco finished with 307 yards and had a touchdown pass in the first half, but his mistakes under pressure in the third quarter were too much for the Browns to overcome on a day when Stroud easily outshined him in his playoff debut.

The previous highest-drafted rookie QB to win a postseason game was the New York Jets’ Mark Sanchez, who was the fifth overall pick in 2009.

Cleveland’s Deshaun Watson was under center for the Texans during their last playoff run but played just six games for the Browns this season before having season-ending shoulder surgery. He was on the sideline Saturday for just the second time since his surgery, watching the coming out party for the man who replaced him as Houston’s franchise quarterback.

The sellout crowd was rowdy and ready for Houston’s return to the postseason after three awful seasons where the team combined for just 11 wins. They chanted “MVP! MVP!” throughout the game when Stroud dropped back to pass.

Collins had six receptions for 96 yards and a touchdown, and Devin Singletary ran for 66 yards and a late score for Houston.

Cleveland’s Kareem Hunt ran for a touchdown and had a TD reception in the first half, but he had just 26 yards rushing.

The Browns took a 7-3 lead when Hunt scored on a 1-yard run with about two minutes left in the first quarter.

A 29-yard run by Singletary started Houston’s next possession before John Metchie III grabbed a 27-yard reception. Two plays later, Stroud connected on a short pass tp Collins for a 15-yard score that put the Texans on top, 10-7.

The Browns got another huge gain on the first play of their next drive when Flacco found Harrison Bryant for a 47-yard reception. Hunt struck again when he grabbed a shovel pass from Flacco and ran 11 yards for a touchdown that gave Cleveland a 14-10 lead.

It lasted only 10 seconds, as Jordan grabbed a short pass and outran multiple defenders for a 76-yard touchdown to make it 17-14. It was Houston’s longest play this season, and the longest in franchise playoff history.

Stroud’s third TD toss was a 37-yard pass to Schultz that pushed the lead to 24-14 with about a minute left in the second quarter.

With about six minutes left in the third quarter, Flacco was hit by Derek Barnett as he threw, and his pass was picked off by Nelson and returned 82 yards for a touchdown.

The Browns went for it on fourth-and-2 on their next drive, but Flacco was picked off again. This time, Harris returned it 36 yards to make it 38-14.

The Texans are the first team to return two interceptions for touchdowns in a game since the Seahawks did it on Jan. 5, 2008.