sentences:  On August 2, 1987, Koshinaka vacated the Junior Heavyweight title due to an ankle injury.When he returned that fall, Koshinaka slowly rebounded, but the rebound was big when he won the first Top of the Super Juniors league in 1988, defeating Hiroshi Hase, the reigning IWGP Junior Heavyweight Champion at the time, in the finals on February 7, 1988, earning him a title shot against Hase on March 19, 1988, but lost.He tried again to wrest the Junior Heavyweight title from Hase on May 8, 1988, but failed again.