Felix Doubront has won the No. 4 spot in the Red Sox rotation. As expected. The left-hander has posted a 2.70 ERA over 16 2/3 innings this spring to win a spot, striking out 10 batters while walking six. Doubront has been injury-prone at times, but he can touch the mid-90s with his heater and has posted decent strikeout rates in the minors. There's AL-only league appeal here.