Xu signed with the Baltimore Orioles as a free agent on July 20, 2015 from the MLB Development Center in Wuxi, Jiangsu, China, making him the first player from one of MLB's three development centers in China to sign with a major league team.

[1][2] In 2016, Xu made his professional debut with the Gulf Coast League Orioles, where he slashed .247/.271/.284 with no home runs and nine RBI in 33 games.

[3] Xu returned to the GCL Orioles in 2017, playing in 15 games and batting .180/.267/.256 with no home runs, seven RBI, and three stolen bases.

[4] In 2018, Xu was promoted to the Low-A Aberdeen IronBirds, where he spent the entirety of the season.

On May 27, 2019, Xu signed with the Kōchi Fighting Dogs of the Shikoku Island League Plus.