By Madison Williams The designated hitter’s new contract ranks the fifth most valuable in MLB history among players who have yet to reach arbitration. View the original article to see embedded media. Yordan Álvarez and the Astros have agreed to a six-year, $115 million contract extension, per ESPN’s Jeff Passan. This marks the biggest contract for a designated hitter in MLB history. The 24-year-old’s contract is the fifth biggest for a player who hasn’t reached arbitration. His contract is behind only the Padres’ Fernando Tatis Jr. (14 years, $340 million), Rays’ Wander Franco (11-year, $182 m…