Napoli was 0-for-3 with three strikeouts as the Red Sox struggled to generate offense in the ALCS opener.
"It's part of baseball," said Carp, who will be making his first career postseason start. "On any given day things can happen. Who's to say we're not going to score 20 [runs] off [the Tigers] tomorrow?"
Because Scherzer has been so tough on right-handed batters, holding them to a .165 average compared to a .222 average against left-handers, Carp may give the Red Sox a better chance at first base. He's 2-for-8 against Scherzer lifetime. Napoli is 1-for-13.
Napoli, who is 2-for-17 in the postseason, has been dealing with plantar fasciitis in his left foot.
"I feel good up there," he said. "I'm not searching or anything. Just going up there trying to do what I do. I'm still confident I'll go out tomorrow and get five hits. I don't know, you just got to keep going."
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. Jason Mastrodonato is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.