In 438 appearances for the team mainly in relief, he tossed 661+2⁄3 innings, compiling a 35–43 record and 3.43 ERA with 488 strikeouts.

On May 28, Tateyama recorded his one and only MLB save during a 10–1 Rangers victory over the Kansas City Royals.

In the 2011–2012 offseason, the Rangers signed Japan's best starting pitcher Yu Darvish to a 5-year deal.

[5] He was released prior to the season on March 21, 2013, and re–signed with the organization on a minor league contract two days later.

[10] Tateyama subsequently returned to Japan to sign with the Hanshin Tigers of Nippon Professional Baseball on June 25, 2014.

[17] A sidearm pitcher, Tateyama relied chiefly on a sinking fastball that averaged 87–88 mph and a curveball in the low 70s.