The Marlins have reached an agreement with infielder Yadiel Rivera, as Rivera himself announced via his Twitter feed that he is joining the organization. Rivera elected to become a free agent after he was outrighted off the Brewers’ 40-man roster in late September. Rivera, 25, was a ninth-round pick for the Brewers in the 2010 amateur draft and he appeared in each of the last three big league seasons, posting just a .434 OPS over 88 career MLB plate appearances.