Wallace did not see any action during his freshman and sophomore years at Alabama. He earned a walk-on scholarship before his junior year in 2016.[3] In six games, Wallace totaled 11 tackles.[4] During his senior year, Wallace started in 14 games. He was a starter during the 2018 College Football Playoff National Championship game, where Alabama won in overtime over Georgia, 26–23.[5] Wallace totaled 48 tackles and caught three interceptions in his senior year.[6]
On November 6, 2018, the Bills promoted Wallace from their practice squad to the active roster after releasing Phillip Gaines.[11] On November 11, 2018, Wallace made his professional regular season debut and first career start and made one tackle and a pass deflection during a 41–10 victory at the New York Jets in Week 10.[12] In Week 16, he collected a season-high eight combined tackles during a 24–12 loss at the New England Patriots.[13] He finished his rookie season in 2018 with 37 combined tackles (24 solo) and three pass deflections in seven games and seven starts.[14]
Wallace was named a starting cornerback to begin the season, opposite Tre'Davious White.[15] Following an inconsistent start to the season, Wallace eventually saw his playing time reduced in favor of Kevin Johnson.[16] In week 15, Wallace caught his first career interception against the Pittsburgh SteelersonSunday Night Football, picking off Devlin Hodges to seal a 17–10 Bills victory in the final moments to help Buffalo clinch a playoff berth.[17] In the regular season finale against the Jets, Wallace logged another interception off Sam Darnold, but suffered a sprained ankle on the play,[18] which kept him out of the Bills' playoff game against the Houston Texans.[19] In the 2019 season, he started in all 16 games. He finished with 76 total tackles (66 solo), two interceptions, and nine passes defended.[20]
On April 2, 2020, Wallace was re-signed to a one-year contract by the Bills, regaining his starting position despite the team signing veteran cornerback Josh Norman. In Week 3 against the Los Angeles Rams, Wallace recorded his first interception of the season during the 35–32 win.[21] Wallace injured his ankle the following week against the Las Vegas Raiders and was ruled out the rest of the game.[22] He was placed on injured reserve on October 7, 2020.[23] He was activated on October 31.[24] He was placed on the reserve/COVID-19 list on November 14, 2020,[25] and activated on November 19.[26] In Week 14 against the Steelers on Sunday Night Football, Wallace intercepted a pass thrown by Ben Roethlisberger late in the fourth quarter to secure a 26–15 win for the Bills.[27] In the 2020 season, Wallace appeared in 12 games, all starts. He finished with 48 total tackles, two interceptions, and eight passes defended.[28]
Wallace re-signed with the Bills on a one-year contract on March 26, 2021.[30][31] He became the top cornerback on the roster after White suffered a torn ACL in week 12 and missed the rest of the season, but Buffalo still finished the year with the league's top passing defense despite White's injury. Wallace, in particular, allowed just a 72.6 passer rating when targeted by opposing quarterbacks.[32] In the 2021 season, Wallace started all 17 regular season games and both of the Bills' postseason games. He finished with 58 total tackles, two interceptions, and ten passes defended.[33]
On March 17, 2022, the Steelers signed Wallace to a two-year, $8 million contract that includes a signing bonus of $2.96 million.[34][35] In the 2022 season, he appeared in 15 games and started nine. He finished with 48 total tackles, four interceptions, and 13 passes defended.[36]
