Yoshinobu Takahashi hurt his left leg while running out a triple during Thursday's game against Yokohama. He was promptly removed and taken to the hospital. The Yomiuri Giants took Takahashi off the active roster today and announced that he was diagnosed with a calf strain. There is no timetable for his return.
Source: Daily Sports 4/5/2013
UPDATE 4/6 @ 4:47pm -
Sponichi puts Takahashi's return some time in June, at the earliest. Nikkan Sports figures it could take three or more months.