SAN DIEGO -- The San Diego Padres' misery reached a new level Monday.
Catcher Wilin Rosario drove in two runs as the Colorado Rockies handed the Padres their 10th consecutive defeat with a 4-2 decision before a crowd of 20,400 at Petco Park.
The Rockies (43-47) snapped a three-game skid, while the Padres (40-50) suffered their 12th setback in 13 games.
Tyler Chatwood blanked the Padres until they scored twice in the seventh inning. Chatwood got help from reliever Rex Brothers, who retired Chase Headley with the bases loaded to prevent San Diego from scoring more.
"He did exactly what we needed," Colorado manager Walt Weiss said of Chatwood's performance that provided some relief for a bullpen that got knocked around in a three-game sweep against the Arizona Diamondbacks over the weekend. "He's done that a lot this year. He's been real good."
Chatwood (5-2) has been particularly impressive against the opposition in the National League West. He improved to 4-1 with a 2.43 ERA against division opponents. On the road this season, he is 3-1 in five starts with a 0.96 ERA.
Chatwood allowed two runs on five hits with three walks and four strikeouts in 6 2/3 innings Monday. The runs were the first he's given up to an NL West opponent in 18 2/3 innings this season.
"Me and Wilin were on the same page," Chatwood said. "I always want to go right after guys. Defense made a lot of good plays behind me."
After Brothers' one-out outing, Matt Belisle retired the side in order in the eighth before Rafael Betancourt pitched a scoreless ninth to record his 12th save.
The Rockies scored two runs in the first and two more in the sixth to chase Padres starter Edinson Volquez (6-7). Jonathan Herrera scored Nolan Arenado with a squeeze bunt in the sixth for a 3-0 advantage.
Volquez, who allowed four runs on eight hits with four walks in 5 1/3 innings, followed that by walking Chatwood to load the bases. Corey Dickerson's sacrifice fly to deep left gave Colorado a four-run cushion.
"A little erratic at times. (Volquez) tried to reel it back in," Padres manager Bud Black said. "Put some zeros on the board in the middle of the game. A little erratic with the heater from the get-go, and they capitalized on it."
Volquez got off to a rocky start, giving up a two-run double to Rosario with one out in the first. Volquez escaped further damage by getting Arenado to ground into an inning-ending double play.
The Padres' runs came courtesy of a bases-loaded walk to Everth Cabrera and an RBI infield single by Kyle Blanks.
Still, it wasn't enough to present San Diego from dropping its ninth game in the past 11 meetings with the Rockies.
"Obviously, we have to right the ship," said Padres outfielder Will Venable, who went 1-for-4. "Of course you can't say it doesn't bother you because every loss it gets worst. But you have to isolate each game and just focus on that day."
NOTES: Rockies OF Carlos Gonzalez did not play and is listed as day-to-day with a sore right middle finger. The injury forced Gonzalez to leave in the ninth inning of Sunday's game against the Arizona Diamondbacks. ... Rockies RHP Roy Oswalt was placed on the 15-day disabled list with a left hamstring strain. Oswalt, who is 0-4 with a 7.64 ERA, left in the second inning of Sunday's loss. He was hurt while covering home plate after throwing a wild pitch. OF Charlie Blackmon was recalled from Triple-A Colorado Springs to take Oswalt's spot on the roster. ... Rockies SS Troy Tulowitzki (rib) and OF Dexter Fowler (wrist) began rehab assignments Monday night with Triple-A Colorado Springs. ... Padres C Yasmani Grandal has "significant damage" to the ACL and MCL in his right knee and is done for the season, Black said. Grandal is scheduled to have reconstructive surgery in about two weeks. The Padres had expected the worst for Grandal, who was placed on the 60-day disabled list Sunday. ... Padres LHP Robbie Erlin was shipped back to Triple-A Tucson, and the club promoted RHP Brad Brach from Tucson for the third time this season.