2021 season Stevenson was selected by the
New England Patriots in the fourth round, 120th overall, of the
2021 NFL draft. He signed his four-year rookie contract with New England on May 19, 2021. After being lightly used during the first eight games of the season, Stevenson had a breakout game in week 9 against the
Carolina Panthers, with 106 all-purpose yards that included a 41-yard reception on a short out-pattern that set up a Patriots touchdown, before leaving the game with a
concussion. The following week versus the
Cleveland Browns, with regular starter
Damien Harris inactive due to a concussion in the prior week, Stevenson was named the starter. He scored two touchdowns on 100 yards rushing, and added another 14 yards on receptions as New England won 45–7. In Week 11 against the
Atlanta Falcons on
Thursday Night Football, Stevenson once again led the team in rushing, splitting carries with starter Damien Harris, and ending up with 69 yards on 12 carries in the 25–0 win. He continued to serve as the team's #2 running back behind starter Harris, gaining 46 yards on nine carries in week 13 win against the
Tennessee Titans and taking the bulk of the load in a run-heavy win over the
Buffalo Bills in week 14, a game in which the Patriots only threw the ball three times, amassing 78 yards on 24 carries. He finished the season with 606 rushing yards and five touchdowns in 12 games and two starts.
2022 season Stevenson had a breakout season in 2022, despite starting the season as the backup to Damien Harris. In Week 5 against the
Detroit Lions, Stevenson rushed for 161 yards on 25 carries in a 29–0 win. The following week, in his first start of the season, he rushed for 76 yards and two touchdowns in a 38–15 win over the Browns. In Week 15, he ran for a career-high 172 yards and a touchdown on 19 carries. He finished the season with 1,040 rushing yards and five touchdowns along with a team-leading 69 catches to go with 421 receiving yards and one touchdown.
2023 season In the 2023 season, Stevenson had 156 carries for 619 rushing yards and four rushing touchdowns to go with 38 receptions for 238 receiving yards in 12 games.
2024 season On June 20, 2024, Stevenson signed a four-year, $36 million contract extension that included $17 million guaranteed with the Patriots. On October 4, head coach
Jerod Mayo announced that Stevenson had been demoted from his starting role due to fumbling issues. In Week 8 against the
New York Jets, Stevenson rushed for 48 yards and two touchdowns, including a game-winner in the 25–22 win. In the 2024 season, he had 207 carries for 801 rushing yards and seven rushing touchdowns to go with 33 receptions for 168 receiving yards and one receiving touchdown.
2025 season Stevenson entered the 2025 season as the starting running back. He suffered a toe injury in Week 8 and missed three games, during which time rookie
TreVeyon Henderson took over the starting role, and eventually led to a shared workload as the season progressed. In Week 18, Stevenson had 131 rushing yards and 22 receiving yards with a pair of rushing touchdowns and one receiving score in a 38–10 win over the Miami Dolphins, earning AFC Offensive Player of the Week. He finished the season second behind Henderson with 603 rushing yards and seven touchdowns, along with 32 catches for 345 yards and two touchdowns, helping the Patriots clinch the 2nd seed in the AFC and a 14–3 record. In a 16–3 win against the
Los Angeles Chargers in the
Wild Card round, Stevenson had 53 rushing yards and 75 receiving yards, leading the team in receiving yards in the game. In Super Bowl LX, Stevenson had 63 scrimmage yards and a receiving touchdown in the 29–13 loss to the Seattle Seahawks. == NFL career statistics ==