Eddy Chen Tap Here To Add Us Weekly As A Trusted Source Add as a preferred source on Google Sydney Sweeney fully committed to accurately portraying boxer Christy Martin in her upcoming biopic. Sweeney, 27, put her body transformation fully on display in the trailer for Christy, which dropped on Thursday, September 11. The actress portrays Martin, 57, a professional boxer who competed from 1989 to 2012 and made history as the first female boxer elected to the Nevada Boxing Hall of Fame.