The Red Sox #4 prospect Justin Masterson will be making his major league debut tomorrow afternoon at Fenway Park according to The Portland Press Herald.
Masterson throws one of the most devastating sinkers in professional baseball.
In 19 innings in AA this year he’s struck out 23 while walking 5. His ERA is a minuscule 0.95.
He sports a freakish 3.57 ground outs to air outs ratio.
