Seven-time Cy Young award winner Roger Clemens will join ESPN’s MLB Opening Day Astros-White Sox broadcast as an analyst, the network announced Wednesday. Here’s what you need to know: Clemens will call the March 30 game (7 p.m. ET) alongside Karl Ravech, Eduardo Perez and Buster Olney. David Cone, the usual “Sunday Night Baseball” team analyst alongside Ravech and Perez, will be away calling the Yankees’ opener and will return for the first Sunday night game of the season on April 2. Clemens, 60, has previously appeared on ESPN’s “KayRod” alternate Sunday night broadcast with Alex Rodriguez and Michael Kay,…