Much maligned 2006 #1 pick Ian Kennedy has been pitching for Mayaguez of the Caribbean winter league. He pitched decently in his first few starts, but has really gotten it going in his last two.
16 IP, 6 H, 0 R, 0 ER, 1 BB, 10 K
Hard to improve on that. Obviously there's a long way between a winter league and the bigs, but a full head of confidence heading into spring training certainly can't hurt.
Meanwhile, Melky Cabrera is hitting .345, and Robbie Cano .308 in the same league.