Yasuhiro Ogawa left tonight’s game against the Chunichi Dragons at Nagoya Dome with tightness in his back. He was removed in the sixth inning with runners on first and second and no out. He first started feeling some pain while pitching in the fifth inning. The Yakult Swallows are planning to take him off the active roster.
Source: Sanspo 5/27/2017
[UPDATE 6/1 @ 9:15pm]
Ogawa was examined (MRI) at a hospital in Tokyo on May 29 and diagnosed with a strain in his left internal oblique muscle.
Source: Sanspo 6/1/2017
[UPDATE 6/23 @ 6:51pm]
Ogawa could return to the active roster in time for a start during a nine-game stretch that begins on July 4. He is set to pitch in a Ni-gun rehab game against Nippon Ham on June 24.
[UPDATE 6/24 @ 6:46pm]
Ogawa pitched in a Ni-gun rehab game against Nippon Ham today. He entered the game in the eighth inning and did not allow a run or a hit over an inning of work (E6, G4dp, Ks). He threw ten pitches and topped out at 144km/h. This was his first game since May 27.
Added additional performance information on 6/24 @ 6:52pm.