<P> The Indians and Royals wore Negro Leagues throwbacks May 7 . The Indians wore the uniforms of the Cleveland Buckeyes, and the Royals wore the uniforms of the Kansas City Monarchs . </P> <P> The Red Sox and Cardinals wore 1967 throwbacks May 16 to mark the 50th anniversary of the Cardinals' 1967 World Series title . </P> <P> The Padres wore 1990s throwbacks June 14 and August 2 . </P> <P> The Cubs and Pirates wore Negro Leagues throwbacks June 16 . The Cubs wore the uniforms of the Leland Giants, while the Pirates wore the uniforms of the Homestead Grays . </P>

When does the major league baseball playoffs begin