Both will have another chance to notch a victory when Colorado opens a three-game set in Milwaukee on Friday night.
Chacin's last start, on Saturday, was interrupted by a two-hour rain delay, and he ultimately settled for a no-decision despite exiting the game with a four-run lead in the fifth. Marcum, on the other hand, wasn't a victim of weather, just a lack of run support.
The right-hander allowed just two runs on three hits over seven solid innings, but took the defeat in a 2-1 loss to the Braves on Saturday. More important, perhaps, was the fact that Marcum -- who struggled with soreness in his shoulder during Spring Training -- registered 105 pain-free pitches his last time out. The Brewers hope for more of the same on Friday.
"My arm feels great," Marcum said after surpassing the 100-pitch plateau for the first time this year. "I got up to 105 pitches, so my pitch count is no longer an issue."
Chacin is just hoping he'll have the opportunity to throw that many pitches this time. He threw 64 -- 41 for strikes -- before watching Mother Nature and a D-backs rally erase his bid for his first win of the season.
Despite the improved outing -- Chacin allowed four runs in four innings in his debut -- and the high strike percentage, manager Jim Tracy is hoping to see him locate his pitches even better on Friday night.
"His command was better tonight," Tracy said after Chacin walked three D-backs hitters, "but it can still be better, because there were some 2-0 counts. There were some walks."
Rockies: Tulo struggling physically, mentally
Troy Tulowitzki was given the night off on Wednesday, with Tracy hoping to allow his All-Star shortstop to rest both his mind and body amid his early-season struggles. Tulowitzki admitted that his six errors -- matching his total from all of last season -- have started to affect the way he approaches his game.
"I'm taking the field and thinking about it," said Tulowitzki. "I never thought about defense [last year]. I just go out there and play, and if I made an error, I made an error. ... But I wasn't worried about it. So, yeah, I think about it. It's in my head. I'd be lying if I said it wasn't in my head. I think about it because I care."
Brewers: Gamel gets a day of rest
The Brewers gave Mat Gamel a day out of the starting lineup on Thursday in order to prepare him for the weekend series against Colorado. Manager Ron Roenicke thought it would benefit the team to both rest Gamel and get Travis Ishikawa a rare start at first base. Ishikawa went 2-for-4 with two RBIs, and Gamel later pinch-hit and struck out with the potential tying run on base.
"I know over the course of the long season that sometimes, [with] a quick day game after a night game, it's a good time to give a guy a day off," Roenicke said of his reasons for giving Gamel a rest. "This day off won't affect what he does [on Friday]. When you're talking three days in a row or something, yeah, that can affect a guy. One day won't."
The Brewers won six of the last nine meetings a year ago to take the season series for the first time in five years. The Rockies had won each of the previous four season series dating back to 2007.
Aramis Ramirez is 5-for-9 with three extra-base hits, including a homer, in his career against Chacin.
Ishikawa was the last Milwaukee position player to get a start.
The Rockies won two straight games to close out their homestand with a winning record, but they're 1-2 on the road this year.