[2][3][4] After signing, Chapman made his professional debut at the rookie level Arizona League Athletics.

His entire 2015 season was spent with the Class A-Advanced Stockton Ports where he batted .250 with 23 home runs and 57 RBIs in 80 games.

[6] He suffered a wrist injury on a check swing in the first series of the season and spent two weeks on the disabled list.

[9] On June 16, Chapman had his first major league hit and collected three RBIs (including the go-ahead run) against the New York Yankees.

[10] He spent the remainder of the season with Oakland after his June 15 call-up, batting .234 with 14 home runs and 40 RBIs in 84 games.

[11] Chapman finished his 2018 campaign batting .278 with 24 home runs and 68 RBIs, offering solid baserunning and excellent defense as well.

He underwent ulnar sided sesamoid bone excision surgery on the thumb on October 16 in Los Angeles.

[18] On September 12, 2020, Chapman decided to opt out for the remainder of the season due to hip tendonitis that would require surgery.

[23] On March 16, 2022, the Athletics traded Chapman to the Toronto Blue Jays for Gunnar Hoglund, Kevin Smith, Zach Logue, and Kirby Snead.

[24][25] On March 22, 2022, Chapman signed a two-year contract worth $25 million with the Blue Jays, avoiding salary arbitration.

[32] He uses a two-handed gather on the forehand, and one-handed backhand with a basketball defensive crouch to prevent the ball from sailing.