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6/7/2014 4:06 P.M. ET

Rosario scratched late from Rox lineup by Weiss

DENVER -- Rockies manager Walt Weiss scratched catcher Wilin Rosario from the lineup about an hour before Saturday's game against the Dodgers. No immediate announcement was made as to the reason.

The decision came not long after Weiss enthusiastically talked about the at-bats improving for Rosario, who went into Saturday with a .234 batting average, five home runs and 22 RBIs in a season that has been hampered by hand and wrist injuries, as well as a stint on the 15-day disabled list with the flu.

Weiss had intended to use Rosario, known around the clubhouse as "Baby Bull," as the cleanup hitter. Instead, Troy Tulowitzki batted cleanup. Michael McKenry batted sixth.

"I've seen signs of 'Bull' coming around," Weiss said. "He's taken some good swings, hit some balls hard, and I think he's showing signs of taking off. He's a dangerous bat. Even though he's gotten off to a slower start this year, he still puts fear in the opposing pitcher. They know if they make a mistake, he's going to hit it a long ways."

Bergman to make debut in series opener vs. Braves

DENVER -- Right-handed pitcher Christian Bergman, a 24th-round Draft pick in 2010 who has developed into a front-line pitcher at Triple-A Colorado Springs, will be called upon to start for the Rockies in his Major League debut Monday night against the Braves at Coors Field.

Bergman, 26, who pitched four seasons at Cal Irvine, is 4-4 with a 3.84 ERA in 12 starts for Colorado Springs.

"He's performed very well, particularly in Colorado Springs, where he's been dominant," Rockies manager Walt Weiss said. "He's a very intelligent pitcher, very good command, and has the ability to execute a scouting report and a game plan. He has a very good feel for pitching."

Bergman takes the rotation spot of right-hander Jordan Lyles (5-1, 3.52 ERA), who suffered a fractured left hand during his last start.

Sore shoulder again keeps Cuddyer from lineup

DENVER -- Sunday will go a long way toward determining whether the Rockies have to place veteran Michael Cuddyer on the disabled list with soreness in the back of his left shoulder, which he suffered while diving for a ball while playing third base on Thursday night.

Cuddyer missed his second straight start on Saturday.

"I would say 'No' right now, " Rockies manager Walt Weiss said when asked Saturday whether the DL is an option. "Tomorrow is a big day for Cuddy, to see how he feels. Tomorrow will be a test for him."

Thomas Harding is a reporter for MLB.com. Follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.