Asao was diagnosed with an injury to his right shoulder joint in May 2012. He returned to the mound in September. He got a late start the following season because of issues with the shoulder. He developed elbow pain before the start of the season in 2014. He recovered in June, but again had problems later that year in August. He pitched in thirty-six games in 2015, but started having problems with his shoulder during spring camp in 2016. He started pitching in Ni-gun games in April, but started having problems in May. He returned to the Ni-gun mound in July, but never made it back to Ichi-gun. He is hoping to pitch at Ichi-gun this year.
Source: Nikkan Sports 3/5/2017