Seiichi Uchikawa appeared to tweak something near the base of the left side of his neck after a swinging strike during an at bat in the seventh inning of tonight’s game against the Yokohama Bay Stars. He left the field for treatment and was ultimately replaced by a pinch-hitter. He was sent to a hospital in Kanagawa for tests.
Source: Sponichi 6/2/2017
[UPDATE 6/3 @ 9:13pm]
Uchikawa was taken off the active roster today as a precaution. He will remain with the Ichi-gun team for the time being.
[UPDATE 6/4 @ 6:49pm]
The Softbank Hawks announced today that Uchikawa was diagnosed with cervical sprain.
[UPDATE 6/10 @ 10:56pm]
Uchikawa might not be ready to rejoin the active roster until after Inter-league play. Kimiyasu Kudo does not want to rush his return.
Source: Sponichi 6/10/2017
[UPDATE 6/11 @ 9:56pm]
Uchikawa will not be with the team during the next road series that begins on June 13 (vs Yomiuri at Tokyo Dome). He will instead remain in Fukuoka and continue his rehab. The Hawks might wait until after the Inter-league season ends to add him to the active roster.
[UPDATE 6/21 @ 12:12pm]
Uchikawa started taking living batting practice at the Chikugo facilities on June 20. He will join Ichi-gun practices on June 21. Since he has not played in any games for almost three weeks, he might be get a few at bats during a Ni-gun game on June 22. Depending on his condition, he might be okay to return to the active roster on June 23.
[UPDATE 6/21 @ 9:51pm]
Uchikawa is still having problems with his neck. He did not swing the bat at full strength during batting practice today. He will not be playing in a Ni-gun rehab game on June 22.
Source: Nikkan Sports 6/21/2017
[UPDATE 6/24 @ 9:30pm]
Uchikawa could return to the active roster on June 27. The Hawks would like to give him a chance to play in a couple of games at Ni-gun, but that might not be possible depending on weather conditions.
Source: Sponichi 6/24/2017