They finished a six-game home stand with four wins and two losses, capped by Jameson Taillon's complete game one-hitter in Sunday's finale against the Reds.
The game was originally scheduled to kick off Monday at 1:20 pm at Wrigley Field.
Celis went 4-for-5 with three runs, while Mallens gave up four hits while striking out eight and walking two.
Rizzo said his low back tightness has been getting better each day and right now, it's just a matter of ensuring this doesn't linger throughout the next six-plus months.
The Cubs have a 5-4 record on the 2018 season but those have all been road games. As of Sunday, he was considered doubtful for Monday's series opener against the Pirates. "It's just we have to get the field clear - obviously you don't want anyone to slip and fall". You can't play tomorrow and set myself back 10 days.
Rizzo will miss a fourth straight game after sitting out the final three games of the series against the Brewers.
Expected cold temperatures Monday in Chicago could reek havoc on Rizzo's back stiffness, but temperatures are expected to rise throughout the week.
The Brewers have struggled with sloppy defense so far this season, already committing 13 errors in their first nine games.
"Well, he's from SC", manager Joe Maddon said of Edwards. "Hopefully this is going to be the biggest of the downs and I'll get back going on a normal pace". The Cubs tried pushing back the scheduled start time by an hour, but the snow persisted. He allowed just one earned run, four hits and six walks in six innings in his first start against Cincinnati. The 6-foot-5 right-hander held the Tigers to only two runs in five innings in his season debut.