Masahiro Tanaka, the Japanese pitcher who went unbeaten last season, has signed a seven-year Major League Baseball deal worth $US155 million ($A177 million) with the New York Yankees.
The 25-year-old right-hander, whose contract is the major leagues' highest for an Asian-born player, went 24-0 with a 1.27 earned-run average and 183 strikeouts with only 32 walks in 212 inning for the Japan Series champion Rakuten Eagles.
The Yankees spent another $US20 million in a posting fee to the Eagles to obtain Tanaka, who was sought by several US clubs and considered the best pitcher available by most teams.
Tanaka, who reportedly has an opt-out clause after four years in the contract, spent seven seasons with Rakuten, debuting at age 18 and going 99-35 with a 2.30 earned-run average in 175 games while striking out 1238 batters over 1,315 innings.
His deal ranks as the fifth-highest for a pitcher in Major League Baseball history, trailing the seven-year deals for Clayton Kershaw of the Los Angeles Dodgers at $215 million, Detroit's Justin Verlander at $US180 million, Seattle's Felix Hernandez at $175 and his new Yankee teammate, C C Sabathia, at $US161 million.
Tanaka fills out a Yankee starting rotation that includes Japan's Hiroki Kuroda, Dominican Ivan Nova and Sabathia.
The Yankees and other major league clubs were faced with a Friday deadline to reach a deal with Tanaka or see him return to Japan for another season.
With the signing, the Yankees figure to soar well beyond the $189 million in salaries they had hoped to spend for their 2014 campaign.
The Yankees won only 85 games last season, finishing in third place in the American League East division, but have added free agents Carlos Beltran and Jacoby Ellsbury to the lineup in the off-season and with Tanaka have bolstered their pitching to return to contention for a playoff spot.
