The Mets' Kirk Nieuwenhuis bats against Pirates starter Gerrit Cole...

The Mets' Kirk Nieuwenhuis bats against Pirates starter Gerrit Cole in the first inning on Saturday, June 28, 2014 in Pittsburgh. Credit: AP / Keith Srakocic

The Mets and Pirates paid tribute to the Negro Leagues Saturday by wearing uniforms from the Brooklyn Royal Giants and the Pittsburgh Crawfords. The Mets' distinctive blue uniforms -- with matching blue pants -- were part of Pittsburgh's Heritage Weekend celebration.

The Royal Giants played from 1905 to 1942 as a member of the National Association and the Eastern Colored League. They also played as an independent franchise for some of their history.

Their best days came during the dead-ball era, when they were considered a top East Coast team. The club once beat Connie Mack's Philadelphia Athletics in a pair of exhibition matchups.

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