MLB Power Rankings: Cardinals and Royals rivalry expands to top of the rankingsByKyle Franzoni|May 13, 2015, 2:53 PM EDTShare on FacebookShare on XShare on RedditCopy ArticleAdd us as a preferred sourcePrev2 of 7NextMay 11, 2015; Los Angeles, CA, USA; Los Angeles Dodgers starter Zack Greinke (21) delivers a pitch against the Miami Marlins at Dodger Stadium. Mandatory Credit: Kirby Lee-USA TODAY SportsNext: 6-10: The Nationals are finally making their statementAdd us as a preferred source on GoogleFollowNextHome/Kansas City Royals