Anthony was considered a top prospect for the
2022 MLB draft and was selected 79th overall by the
Boston Red Sox. He signed with the team and received an over-slot signing bonus of $2.5 million. After signing, Anthony was assigned to the
Rookie-level Florida Complex League Red Sox to begin his professional career. He was promoted in late August to the
Salem Red Sox of the
Single-A Carolina League. Anthony returned to Salem at the beginning of the 2023 season. He batted .228 with one home run and 18 RBI in 42 games played with Salem and was promoted to the
High-A Greenville Drive. Anthony was promoted a second time to the
Double-A Portland Sea Dogs after hitting .294 with 12 home runs, 38 RBI, and 41 runs scored in 54 games played with Greenville. He finished the season with a .272 batting average and 14 home runs with 64 RBIs and 78 runs scored. Anthony was recognized as the Red Sox' minor league hitter of the year for 2023. Anthony began the 2024 season with Portland, ranked as the Red Sox' number two minor-league prospect by
Baseball America. In August, he was promoted to the
Triple-A Worcester Red Sox, along with fellow-prospects
Marcelo Mayer and
Kyle Teel. At the time of his promotion, Anthony had posted a .269/.367/.489
slash line with Portland. The Red Sox invited Anthony to 2025
spring training. He was assigned to Worcester to begin the season, slashing .288/.423/.491 with 10 home runs and 29 RBI. On June 7, Anthony belted a 497-foot
grand slam against the
Rochester Red Wings, which was the longest home run in professional baseball to that point in the year. On June 9, Anthony made his major-league debut for Boston, going hitless in four at-bats with an RBI groundout against the
Tampa Bay Rays. At age 21 years and 27 days, Anthony was the youngest Red Sox player to make his debut since
Rafael Devers, who debuted at age 20 years and 274 days. On June 10, Anthony's uniform number was changed from 48 to 19. The same day, Anthony recorded his first MLB hit, a two-RBI double in the first inning off of Rays pitcher
Ryan Pepiot. Anthony's first career home run with the Red Sox was on June 16, against the
Seattle Mariners. Anthony's first walk-off hit came on August 1, against the
Houston Astros. On August 6, Anthony signed an eight-year contract extension worth $130 million, with significant escalators that could result in a contract worth upwards of $230 million. The deal includes a club option and keeps Anthony under club control through 2034. Anthony was named the
American League (AL) Rookie of the Month for August after hitting .304 with six homers, 13 RBI, four doubles, 15 walks, 21 runs scored, two stolen bases, a .520 slugging percentage and a .390 on-base percentage in 26 games. On September 3, the team placed him on the 10-day injured list with a left oblique strain, sidelining him for the remainder of the regular season. Anthony was a finalist for the AL
Rookie of the Year Award. He finished third in voting. If he had finished first or second, he would have earned several million dollars in escalators on his contract extension. He was named to MLB's 2025 All-Rookie team as an outfielder. ==International career==