Starting pitchers are creatures of habit, so generally, fast starters are almost always ready from the get-go and slow starters almost always need a few starts before finding their groove. With that in mind, here are some good and bad pitchers the last 3 Aprils (With April Record, ERA, WHIP).

GOOD
Jaime Garcia (5-1, 1.60, 1.07)
Jered Weaver (10-1, 1.95, 0.98)
Josh Johnson (7-1, 2.11, 0.96)
Dan Haren (9-5, 2.31, 0.88) (record should be better given good key numbers)
Rickey Romero (6-4, 2.44, 1.08) (Same comment as Haren)

BAD
Rick Porcello (4-7, 6.04, 1.58)
Ryan Dempster (4-5, 5.77, 1.41)
Mat Latos (1-6, 5.57, 1.40) (Could make good money here as Latos will be overvalued early)
Carl Pavano (5-7, 5.56, 1.32)
Scott Baker (3-7, 5.45, 1.43) (Twins could suck more than usual in April)

Everyone feel free to add to this list.