The rookies have a 4.88 combined ERA in 22 starts since veteran Mike Leake made his final outing before his trade to the Giants. Their ERA was ranked 22nd in the Major Leagues, entering Friday.
"It's pretty important. I would like to get deeper in games," said the 24-year-old Holmberg, who has a 6.57 ERA in five starts. "That's my game. I like to get guys out quick and go deep into games. I feel like, personally, I need to do a better job."
In August, Reds starters came into the game ranked 27th in the Majors in innings pitched.