Chiba Lotte Marines Kubo began his professional career with the
Chiba Lotte Marines of
Nippon Professional Baseball. He made his NPB debut on April 2, 2005. Kubo then went on to play for the Marines through the 2008 season.
Hanshin Tigers In 2009, Kubo joined the
Hanshin Tigers of NPB. He played for the team in the 2009, 2010, 2011, 2012, and 2013 seasons before becoming a free agent after 2013.
Yokohama DeNA BayStars Kubo joined the
Yokohama DeNA BayStars of NPB for the 2014 season. He played for the team through the 2017 season before becoming a free agent at the end of the year.
Gary SouthShore RailCats On April 19, 2018, Kubo signed with the
Gary SouthShore RailCats of the
American Association of Independent Professional Baseball. He was released by Gary on May 11, but re-signed on June 28. In 3 games with Gary, Kubo recorded a 4.05 ERA with 4 strikeouts in innings.
Sugar Land Skeeters On July 13, 2018, Kubo was traded to the
Sugar Land Skeeters of the
Atlantic League of Professional Baseball. He finished the year with the Skeeters, pitching in 13 games and posting a 5–2 record and 5.14 ERA. He became a free agent after the season.
Bravos de León On April 3, 2019, Kubo signed with the
Bravos de León of the
Mexican League. He spent the 2019 season with the club and logged an 8-14 record and 5.98 ERA while leading the league with 154 strikeouts. Kubo was released on January 13, 2020.
Hamburg Stealers On December 25, 2022, Kubo signed with the
Hamburg Stealers of the
German Baseball Bundesliga for the 2023 season. Kubo finished the season with 122 innings pitched, 104 strikeouts and an ERA of 1.62, leading the Bundesliga Nord in the former two stats, and ERA with a minimum of 35 innings pitched, winning the Best Pitcher Award of the Bundesliga Nord.
Hyogo Bravers On March 17, 2025, Kubo signed with the Hyogo Bravers of the Sawakami Kansai Independent League in
Japan. ==References==