Pagan hit an RBI single in the third inning, which scored Nori Aoki. He also hit a single in the first inning. Pagan now has a slash line of .350/.373/.447.
Casilla pitched the ninth inning, struck out one batter and held the Padres without a hit. He now has an ERA of 2.13.
Ross went seven innings and struck out five batters. He surrendered seven hits and walked three batters. Ross now has an ERA of 4.15 for the season.
Ross' next start is projected for Saturday against the Diamondbacks.
This is the first time all season that Bumgarner has gone through his time in a game without allowing an earned run. The superb outing drops his ERA to 3.03 of the season. He's now 3-1 for the season.
Bumgarner only allowed two hits against the Padres and had a no-hitter through six innings. He struck out six batters and walked one.
Bumgarner's next start is projected for Saturday against the Marlins.
"It's not optimal," Cubs manager Joe Maddon said of Denorfia's condition. "He repulled the same hammy."
Denorfia went 2 for 2 with an RBI in Tuesday's 10-9 loss to the Cardinals. He now has a slash line of .429/.455/.476. He was taken out of the game in the third inning and was replaced by Junior Lake.
"It's very frustrating," Denorfia said. "I've never had a recurring muscle injury like this before. I took my five minutes to feel bad for myself and I'm moving on and getting ready to get better again."
The Cubs are expected to call up Matt Szczur to fill the open roster spot with Denorfia heading to the DL.
However, in Monday night's 10-9 win over the Cubs, Carpenter's bat was missing in action. Carpenter finished the game 0 for 5 with two strikeouts. This is only the fourth time this season in 24 games that Carpenter has gone without a hit.
This is also the first time in 2015 that Carpenter recorded less than two hits in five at-bats in a single game.
He now holds a slash line of .347/.412/.624.
Reynolds totaled four RBI, which is the amount he had entering the game. He did so by taking an 0-1 pitch for a grand slam, which also scored Jon Jay, Matt Holliday and Jhonny Peralta. The grand slam was Reynolds' second homer of the season.
Reynolds finished the game 2 for 3 and also drew a walk. He entered the game with only six hits in 34 at-bats. Going 2 for 3 with a grand slam raised his slash line to .216/.341/.459.
Ishikawa restarted his rehab assignment after enduring tightness in his back during his previous one. On Monday, he lined a hit to center for a double and was also hit by a pitch.
Montero hit a two-run single in the first inning and followed that with an RBI double in the fourth. Montero has now recorded a hit in six consecutive games and has recorded multiple hits in four of those.
Montero finished the day 2 for 4, scored a run and also drew a walk.
He now holds a slash line of .298/.373/.491.
Maness got the first two batters he faced to line out and ground out before allowing an Addison Russell solo home run. Maness finished things off by getting Dexter Fowler to line out to first. Maness moved his ERA to 3.27 in 11 innings of work with six strikeouts and no walks.