Adell was considered one of the top prospects for the 2017 Major League Baseball (MLB) draft.[4][5][6] He was selected by the Los Angeles Angels with the tenth overall selection in the draft.[7] Adell began his professional career in June 2017 with the AZL Angels, and after batting .288/.351/.542 with four home runs, 21 RBIs, and 10 stolen bases, he was promoted to the Orem Owlz. He spent the rest of the season with Orem, batting .376/.411/.518 with one home run and nine RBIs in 18 games for them.[8]
In 2018, Adell began the season with the Burlington Bees of the Single–A Midwest League, where he hit .326/.398/.611 with six home runs and 29 RBIs in 25 games before being promoted to the Inland Empire 66ers of the High–ACalifornia League.[9] He was chosen to represent the Angels in the 2018 All-Star Futures Game.[10] After 57 games with the 66ers, he was promoted to the Mobile BayBears of the Double–ASouthern League. In 99 games between the three clubs, Adell slashed .290/.355/.543 with 20 home runs, 77 RBIs, and 15 stolen bases.[11]
Adell was among the Angels' non-roster invitees to 2019 spring training, and joined the team there in February.[12] He began the year on the injured list with Mobile.[13] Through 32 games, Adell hit .347 and had six home runs to go along with a 1.018 OPS before being named to the 2019 All-Star Futures Game.[14] Playing right field, Adell went 1-for-2 at the plate with two walks. On August 1, Adell was promoted to the Salt Lake Bees of Triple–APacific Coast League. In 2019, playing for three minor league teams, he batted .289/.359/.475 with 10 home runs and 36 RBIs.[15] After the season, he was selected to play in the Arizona Fall League for the Mesa Solar Sox following the season.[16] And also, on October 10, he was selected for the United States national baseball team in the 2019 WBSC Premier 12.[17] In the tournament he batted .394/.429/.697 with 11 hits (tied for the tournament lead), three home runs, and five RBIs in 33 at bats.[18][19]
Los Angeles Angels
On August 4, 2020, the Angels promoted Adell to the major leagues.[20] He made his debut that night against the Seattle Mariners, going 1-for-4.[21] On August 29, Adell hit his first major league home run against Seattle Mariners pitcher Justus Sheffield. That same night, he hit his second major league home run against Aaron Fletcher.[22] Adell finished his rookie season batting .161/.212/.266 with 3 home runs and seven RBIs in 38 games.[citation needed]
Adell began his 2021 season with Salt Lake. He was called back up to the major leagues on August 2.[23] He made his season debut the following day, going 3-for-4 with two doubles, three RBIs and a stolen base against the Texas Rangers.[24] On August 17 against the Detroit Tigers, Adell hit his first career grand slam.[25] Adell finished the season batting .246/.295/.408, hitting four home runs and 26 RBIs in 35 games.[citation needed] Adell appeared in a career-high 88 games for the Angels in 2022. In 268 at-bats, he slashed .224/.264/.373 with eight home runs, 27 RBIs, and four stolen bases.[citation needed]
Adell was optioned to Triple-A Salt Lake to begin the 2023 season.[26] In a 6-game stretch in April, Adell homered in all 6 games consecutively, setting an Angels franchise record.[27] On June 21, Adell hit a 514-foot (157 m) home run at Smith's Ballpark, the longest home run hit in either the minor or major leagues since Statcast tracking started in 2015.[28] He went 3–for–13 (.231) in 5 games before he was placed on the injured list with a left oblique strain on July 14.[29] Adell was transferred to the 60–day injured list on August 1.[30] He was activated from the injured list on September 18.[31]
Adell played in 130 games for the Angels in 2024, slashing .207/.280/.402 with 20 home runs, 62 RBI, and 15 stolen bases. He was placed on the injured list with a left oblique strain on September 7, 2024, and was transferred to the 60–day injured list two days later, ending his season.[32]