Bryce Harper of the Washington Nationals appeared as a member of the U.S. Olympic women 's gymnastics team , Mike Trout of the Los Angeles Angles turned into singer Lady Gaga .
Carlos Correa was dressed up as Wonder Woman .
Bryce Harper of the Washington Nationals appeared as a member of the U.S. Olympic women 's gymnastics team , Mike Trout of the Los Angeles Angles turned into singer Lady Gaga , and Carlos Correa was dressed up as Wonder Woman .