(Reuters) - New York Yankees ace Masahiro Tanaka left the team on Wednesday to return to New York for a magnetic resonance imaging (MRI) test on his pitching arm, according to a report on Major League Baseball's website.
Tanaka, 25, leads the majors with 12 wins in his first 18 starts for New York and was named to next week's All-Star in his rookie campaign.
The right-hander gave up 10 hits and five earned runs over 6 2/3 innings in a 5-3 loss to the Indians on Tuesday after yielding four runs in his previous start. Tanaka had allowed three or fewer runs in each of his first 16 starts.
The Japanese hurler signed a seven-year contract worth $155 million with the Yankees in January.
Tanaka notched a 99-35 record with a 2.30 ERA in seven seasons with Rakuten in Japan's Pacific League, and he went 24-0 with a 1.27 ERA last year on the way to a Japan Series title.
(Reporting by Larry Fine in New York; Editing by Frank Pingue)