Nationals back in top 10 after five-month absence; Red Sox stay No. 1 Author:Joe LemirePublish date:Sep 19, 2013Unheralded Tanner Roark has been one of the best relievers in baseball this season.Greg Fiume/Getty Images MLB Power Rankings Latest MLB NewsWatch Red Sox-Braves Spring Breakout Games Right Here On Inside The Red SoxWhat Grade Did Yankees Receive for Offseason Moves?New York Yankees' Leader Gerrit Cole Provides Update on His Elbow Injury, Timeline For RecoveryFormer Angels Fan Favorite Announces Retirement From MLBWhy Are Two Of Orioles' Biggest Stars Missing From Lineup Again?