He was drafted and played primarily for the Fukuoka SoftBank Hawks of Nippon Professional Baseball (NPB).

[3] And on August 25, he recorded his first hit and home run with a Grand slam against the Chiba Lotte Marines.

In 2018 season, Uebayashi played in all 143 games and recorded a batting average of .270, a 22 home runs, a RBI of 62, and a 13 stolen bases.

However, he injured his right leg in practice before a game against the Saitama Seibu Lions on May 18, and on May 20 he was diagnosed with a ruptured Achilles tendon that required four weeks of hospitalization and six months of rehabilitation, making it impossible for him to return during the season.

[14] In the match against South Korea national baseball team On November 16, he hit a three-run home run in the bottom of the tenth inning after the team lost three points in the top of the tenth inning.

[16] On February 27, 2019, he was selected for Japan national baseball team at the 2019 exhibition games against Mexico.