Alyssa Nakken of San Francisco Giants makes MLB history as first on-field female coach

It was a first at first base Tuesday night for San Francisco Giants coach Alyssa Nakken, who became the only woman in Major League Baseball history to coach on-field during a regular season game.

Nakken, 31, took over first-base coaching duties at San Francisco's Oracle Park after Antoan Richardson was ejected in the third inning, apparently while instructing the defense, according to CBS Sports.

The Giants were facing the San Diego Padres, whose first baseman, Eric Hosmer, shook an emotional Nakken's hand - and the crowd gave an ovation - to commemorate the historic moment.