He played in Major League Baseball (MLB) for the Tampa Bay Rays, Baltimore Orioles, Seattle Mariners, and Minnesota Twins.

In his freshman year for the Griffin High varsity team, Beckham batted seventh in the order and hit 14 home runs on the season.

[1] Following the season, Beckham competed in the World Wood Bat Association 17-Under Summer Championship, in Cincinnati, Ohio.

Later that year, in August 2007, Beckham took home the MVP Honors at the Aflac Classic in San Diego, California.

Beckham concluded the summer of 2007 having batted .409, hitting nine home runs, 15 doubles, eight triples, and 32 stolen bases, against some of the best competition in America.

Beckham committed to the University of Southern California during his senior year,[3] but maintained his intentions of entering the 2008 MLB Draft.

In 2011, Beckham was selected to the All-Star Futures Game along with fellow Tampa Bay Rays prospects Hak-Ju Lee and Matt Moore.

In his only at-bat, he recorded his first career MLB hit, a single, off of Rangers pitcher Tanner Scheppers.

Beckham was demoted to Triple-A Durham on August 31, 2016, after not hustling home from second base during a game against the Boston Red Sox at Fenway Park.

[17] Upon the acquisition of defensive standout Adeiny Hechavarria, Beckham shifted over to second base[18] He committed 20 errors for the season, the second-most among all American League players.

[13] The Rays dealt Beckham to the Baltimore Orioles for Tobias Myers just before the non-waiver trade deadline on July 31, 2017.

Beckham collected 50 hits in his first month with the Orioles, the second most in team history (Cal Ripken, 53).

[24] He was named the Mariners' Opening Day shortstop, making his debut against the Oakland Athletics on March 20, 2019, in Tokyo, Japan.

[26] On August 6, 2019, Beckham received an 80-game suspension without pay after testing positive for Stanozolol, a performance-enhancing substance, in violation of Major League Baseball's Joint Drug Prevention and Treatment Program.

[29] After going unsigned for the 2020 season, on October 29, 2020, Beckham signed a minor league contract with the Chicago White Sox organization.

[31] After missing the first two months of the 2022 season with a strained left quadriceps, Beckham played for the St. Paul Saints.