Minor leagues

The Tampa Bay Rays chose Beckham with the first overall selection of the 2008 MLB Draft. Beckham signed with the Rays on June 19, receiving a signing bonus of $6.15 million.^[6] He played with the Princeton Rays of the Appalachian League, the Hudson Valley Renegades, the Bowling Green Hot Rods of the Midwest League, and the Charlotte Stone Crabs of the Florida State League.

In 2011, Beckham was selected to the All-Star Futures Game along with fellow Tampa Bay Rays prospects Hak-Ju Lee and Matt Moore.^[7]

In May 2012, Beckham was suspended 50 games for a second positive test for a "drug of abuse".^[8]

After the conclusion of the 2012 season, Beckham was added to the 40-man roster to be protected from the upcoming Rule 5 draft. He was optioned to AAA Durham on March 15, 2013.

Tampa Bay Rays

On September 18, 2013, the Rays promoted Beckham to the majors.^[9] Beckham made his MLB debut on September 19, as a pinch hitter against the Texas Rangers. In his only at-bat, he recorded his first career MLB hit, a single, off of Rangers pitcher Tanner Scheppers.^[10] He had 3 hits, all singles, in 7 at-bats. He scored once and drove in a run.

After the 2013 season, Beckham tore his anterior cruciate ligament. He missed the 2014 season.^[11]

On April 11, 2015, Beckham hit his first major league home run.^[12] For the season, he batted .222 /.274/.429.^[13]

In 2016, Beckham played a backup utility man role, mainly playing SS, but also seeing time at all four infield positions. 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.^[14] He finished the 2016 season batting .247/.300/.434, with 5 home runs and 16 RBIs in 64 games.^[15]

In spring training in 2017, the Rays reported that Beckham had been working on playing in the outfield in an attempt to give him more playing time and a more important platoon role.^[16]

Due to an injury to newly acquired shortstop Matt Duffy, Beckham was able to see an increased amount of playing time at shortstop and even started the opening day game. Beckham started in a majority of the Rays games. This led Beckham to a minor break out. Batting .266/.303/.422 with 8 home runs, 26 RBIs through the first two months. Even with his improved play, Beckham was expected to relinquish his starting role upon Duffy's return.^[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]

Baltimore Orioles

The Rays dealt Beckham to the Baltimore Orioles for Tobias Myers just before the non-waiver trade deadline on July 31, 2017.^[19] He made his Orioles debut the next night, going 2-for-4 with a double and two runs scored. On August 5, in a 5–2 victory over the Tigers, Beckham homered for the third straight game. His home run was the 10,000th in Orioles' franchise history.^[20] Through his first five games with the Orioles, Beckham was 13 for 20, an average of .650, with three home runs, five RBIs, and an OPS of 2.000. Beckham was named AL Player of the Week.^[21]

Beckham went on a 12-game hitting streak to begin his career with the Orioles, before going 0-for-4 on August 13. During the hitting streak, Beckham slashed .531/.549/.939 with seven doubles, two triples, three home runs, nine RBIs and 14 runs scored.

Beckham collected 50 hits in his first month with the Orioles, the second most in team history (Cal Ripken, 53). He hit in 27 of the 29 games and slashed .394/.417/.646 with ten doubles, two triples, and six home runs, while driving in 19 runs and scoring 27 times.

Prior to the 2018 MLB season, the Orioles announced that Beckham would be moved to third base while Manny Machado would be moved to shortstop. Beckham was placed on the 10-day DL on April 25 with a left groin strain,^[22] and he was transferred to the 60-day DL on May 13.^[23]

Seattle Mariners

On January 10, 2019, Beckham signed a one-year contract worth $1.75 million with the Seattle Mariners.^[24] He was named the Mariners' Opening Day shortstop, making his debut against the Oakland Athletics on March 20, 2019, in Tokyo, Japan. Beckham hit safely in 9 of his first 10 games to begin the season, in which he hit .410/477/.846 with 4 home runs and 11 RBI during that span.^[25] As a result, he was awarded the American League Player of the Week honors for the opening week of 2019.^[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.^[27] This effectively ended Beckham's season, finishing with a .237/.293/.461 (100 wRC+) slash line with 15 home runs and 47 RBIs.^[28] On December 2, 2019, Beckham was non-tendered by Seattle and became a free agent.^[29]

Chicago White Sox

After going unsigned for the 2020 season, on October 29, 2020, Beckham signed a minor league contract with the Chicago White Sox organization.^[30] Beckham spent the 2021 season with the Triple-A Charlotte Knights. He played in 45 games, hitting .279 with 11 home runs and 32 RBI's. He became a free agent following the season.

Minnesota Twins

On February 5, 2022, Beckham signed a minor league contract with the Minnesota Twins.^[31] After missing the first two months of the 2022 season with a strained left quadriceps, Beckham played for the St. Paul Saints.^[32] The Twins promoted him to the major leagues on July 30.^[33] On August 26, Beckham was designated for assignment. He cleared waivers and became a free agent on August 31.