Start Duensing or Marshall?

[millerpark]

Wondering if I should drop hellickson and add Duensing vs M's or Marshall as a closer vs the Marlins for Sunday.

SP Roy Halladay
(Phi - SP)
SP Jaime García
(StL - SP) SPPBN ^ @Cin
RP Jonathan Papelbon
(Bos - RP) RPPBN @TB
RP John Axford
(Mil - RP) RPPBN @Col
P Chris Carpenter
(StL - SP)
P Javy Guerra
(LAD - RP) RPPBN @Ari
P Matt Harrison
(Tex - SP,RP) SPRPPBN ^ @Sea
BN Jeremy Hellickson
(TB - SP,RP)
BN Brandon Beachy
(Atl - SP)
BN Jon Lester DL