The coming weekend of May 16-18 presents a new schedule wrinkle for Major League Baseball and it's been branded "Rivalry Weekend."  To be sure, it's a bit of a contrivance, and Rivalry Weekend notably does not include the sport's most time-honored blood feuds like Yankees-Red Sox,

MLB's inaugural Rivalry Weekend is here, as a result of the schedule switching to the anything goes balanced format that allows for interleague at any time, rather than carefully scheduled siloing of American League and National League teams away from each other.

Major League Baseball debuts its inaugural Rivalry Weekend with a Keystone State showdown, as the Pittsburgh Pirates (15-29) head to Philadelphia to face the Phillies (25-18) at Citizens Bank Park. The Pirates are traveling about 100 miles south after dropping two of three in a series against the New York Mets at Citi Field.