Rosscup has left shoulder inflammation.
A strong closer, hard-throwers and a veteran presence has been the winning formula for Chicago.
Welington Castillo drove home the winning run with a long RBI single in the 10th inning.
It appears Kris Bryant will indeed wait until 2015 to make his big league debut.
Darwin Barney is a career .244 hitter and has declined offensively in the last three years.
The Chicago Cubs have placed pitcher Pedro Stop on the 15-day DL with a left groin strain and have called up Zac Rosscup from Triple-A Iowa.
The Cubs’ bullpen has blown four of its six save chances.
Both pitchers will be available to this afternoon.
Jake Arrieta, Brett Jackson, Josh Vitters, Mike Olt and Junior Lake are among those who have agreed to terms.