It's official: The Washington Nationals have bolstered their starting rotation by acquiring former Oakland Athletic Gio Gonzalez. Washington sent four highly ranked prospects to Oakland in return for the biggest trade chip of the winter. Gonzalez will join Stephen Strasburg, Jordan Zimmerman, John Lannan and possibly Chien-Ming Wang or Ross Detwiler in the Nationals rotation.
Washington hasn't been the only team this offseason to improve its starting rotation. The Padres traded Mat Latos to the Reds for several players including Edinson Volquez. The Reds then shipped Travis Wood to the Cubs for Sean Marshall in a four-player deal.
John Danks recently signed a five-year extension with the Chicago White Sox while former Sox pitcher Mark Buerhle decided to take his talents to South Beach and sign with the Miami Marlins. Boston decided that reliever Daniel Bard will begin spring training in the rotation to transition into a starting pitcher. And last, but not least, the Texas Rangers won the rights to Japanese pitcher Yu Darvish.
Strasburg and Gonzalez will be a great tandem when pitching against the very talented NL East teams. There are a ton of great 1-2 combinations in baseball, but where do the Nationals' stars rank? Here's a look at the best 15 top-of-the-rotation duos in MLB today.