Tateyama exercised his international free agent rights at season’s end, and signed with the Texas Rangers. He started the 2011 season on the farm, but made his big league debut on May 24th against the White Sox. He recorded his first career save four days later and his first win on June 21st. Through August 23, he was having an excellent debut season, but things quickly fell apart after that. In fact, Tateyama became the second player in MLB history to allow grand slams to back-to-back hitters (obviously across two mound appearances). The 2012 season was one of ups and downs, in which Tateyama dominated AAA ball but could not find a spot on the top squad. He was released at season’s end but signed a minor-league deal with the Rangers for the 2013 season. He finished his injury-plagued stint with the Rangers without a final promotion to the majors, and was traded to the New York Yankees on June 21st. He spent the remainder of the season in the minors, putting up good numbers but not getting called up. Despite a good spring camp in 2014 with the Yankees, Tateyama struggled on the farm early, and was released on May 9th
Tateyama returned from America and was plucked up by Hanshin on June 25th. He made his return to NPB action on July 31st (at Koshien vs. Yakult Swallows). He gave up 2 runs in 1 inning of work. Just seven relief appearances later, Tateyama was sent to the farm, and at season’s end, he announced his retirement. He became the first (and so far only) player to wear #53 since Norihiro Akahoshi announced his retirement prior to the 2010 season.
Tateyama has remained in baseball as a commentator for Nikkan Sports and local Hokkaido game telecasts.