Duvall began his MLB career in 2014 with the San Francisco Giants, where he hit a home run in his first game. He was later traded to the Cincinnati Reds, where he earned his first All-Star selection in 2016, thanks to his impressive performance. In his first full season in the majors, Duvall played in 150 games and posted a .241 batting average, 33 home runs, and 103 RBIs. His 2017 season was equally impressive, with a .249/.301/.480 slash line to go along with 31 home runs and 99 runs batted in.

In 2018, Duvall was traded to the Atlanta Braves, where he struggled initially. However, he bounced back in 2019, hitting .267/.315/.567 with 10 home runs and 19 RBIs in 120 at-bats in 41 games for Atlanta. He became the first player in franchise history to hit three home runs in a game twice, and in doing so, he was the first player in MLB history to hit those home runs in such an order.

In 2020, Duvall batted .237/.301/.532 with 34 runs, 16 home runs (3rd in the NL), and 33 RBIs in 190 at-bats, leading the National League with the highest fly ball percentage at 52.69%. In Game 5 of the 2021 World Series, he hit a two-out, first-inning grand slam on the first pitch from starting pitcher Framber Valdez, giving the Braves a 4–0 lead. Despite his efforts, the Braves lost 5–9, sending the series to Game 6. Nevertheless, the Braves won Game 6, giving the Braves their first title since 1995 and Duvall's first career World Series championship. At the end of the season, Duvall won the National League Gold Glove Award for right field.

After playing for several teams, Duvall signed a one-year contract with the Boston Red Sox in January 2023. However, he suffered a distal radius fracture of his left wrist in April, which put him on the injured list.

In conclusion, Adam Duvall's career is marked by highs and lows, but he has consistently shown himself to be a talented player. From his impressive All-Star selections to his World Series grand slam, Duvall has made a name for himself in the world of baseball. As he continues to play for the Boston Red Sox, fans can expect him to bring his A-game and continue to achieve career highs.