It has certainly been a busy week for 4minute as they collaborated with Amerie who was in Korea to promote her album and hit song, Heard 'Em All at various events, including the one at Music Bank last night. So even though 4minute ain't in the midst of promotions, they still have a pretty packed schedule like most of the girl groups currently promoting. On March 27th, HyunA from 4minute was invited as the celebrity pitcher to do the opening pitch for the baseball league opener for Lotte Giants against the Nexen Heroes. How well did she pitch? Check out the video for yourself. http://www.youtube.com/watch?v=J6Ivu-NTijg Besides doing the opening pitch, 4minute also performed Muzik. [gallery]