Not that he's really a slow starter, but Johan Santana flat out dominates in the second half.
06- 2.95 Pre ASB/2.54 Post ASB
05- 3.98 Pre ASB/1.95
04- 3.78 Pre ASB/1.21
Post ASB not to mention he went 13-0 in the second half that season
This guy is priceless for the H2H playoff season.