Rodriguez is a fantastic return for the Red Sox, who have made a handful of good moves today. Prior to the season, the 21-year-old was ranked by Baseball America as the 65th-best prospect in the minor leagues. In 16 starts for Double-A Bowie, Rodriguez is 3-7 with a 4.79 ERA and a 1.440 WHIP. This comes in 82 2/3 innings pitched. He has a fastball in the 91-94 mph range, change-up in the 81-86 mph range, and a slider in the 82-86 mph range. His ceiling is probably a number two or three starter.
The Orioles are getting the premium lefty on the trade market in Andrew Miller. The 29-year-old has a good repertoire with two plus pitches; the fastball and the slider. He has only allowed 25 hits in 42 1/3 innings pitched on the year, walking only 13. This is good for a 0.898 WHIP. He is 3-5 with a 2.34 ERA, 1.69 FIP, and a 69 to 13 strikeout-to-walk ratio. Miller's neutral ERA (adjusted by park factors) is 68% better than the average pitcher, as he has a 168 ERA+ on the year.
Besides closer Zach Britton, the Orioles only have one left-hander in their bullpen in Brian Matusz, who has a 4.14 ERA and a 96 ERA+ in 37 innings pitched. Acquiring Miller does fill a need for the team, but giving up Rodriguez may be too much for them. The Orioles are currently in first place in the American League East, by a 2.5 game lead. Miller and Britton will be a shutdown combination in the 8th and 9th innings for Baltimore the rest of the way. However, Miller is a free agent at the season's end.
The Orioles get their man in Andrew Miller, but not after they give up pretty good prospect Eduardo Rodriguez. But when going for a World Series championship, you have to make those risky moves and worry about later when later comes. We will have to see if Miller is a difference-maker down the stretch.