FWIW - My thoughts:
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Polanco - RF (hits lefties well enough, has been hot as of late, and don't want to sit him two games in a row - he sat out yesterday)
Marte - LF
Cutch - CF
Kang - 3B (like Kang better than Ramirez in the 4 spot - though Ramirez has had a nice RBI run....and it improves the D at 3B)
Harrison - 2B (again, better D at 2B....and we know how Walker struggles against lefties)
Cervelli - C (more offense, plus Stewarts work behind the plate has become increasingly shaky. Only would want to use Stewie from here on out on days that Cervelli needs a rest)
Morse - 1B
Mercer - SS
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I'd even consider Rodriguez for 1B, to try to get the best defensive lineup out there behind Cole (Lord knows, he deserves to pitch a game without watching the Keystone Kops infield for a change)....but Morse has been barreling up the ball pretty good since coming over.
Kang/Mercer/Harrison gives you a pretty good defensive infield (way better than Ramirez/Kang/Walker)
I'd probably flip Harrison and Marte in the 2 and 5 spots.....but I doubt Clint would want to bounce Marte around in the lineup, since it has been a very productive group since the break.