While nobody has grabbed the bull by the horns...Especially not Joba Chamberlain...by the numbers the guy who has had the best spring may be Sergio Mitre. I have to say I was very impressed with the stuff he showed last year. Every thing he throws has a lot of movement on it. He's another year post Tommy John surgery so if he has a little more velocity and can control that movement a little more he could be a real asset.