The Rockies try for their second three-game sweep of the slumping Padres as these NL West rivals square off Sunday at Petco ParkAfter taking all three matchups last weekend, Colorado (7-4) had its way with San Diego (2-9) again over the last two days. The Rockies beat the Padres 7-5 on Friday thanks to a pair of homers from Dexter Fowler, then won 9-5 on Saturday behind an impressive group effort.Carlos Gonzalez, Troy Tulowitzki, Michael Cuddyer, Todd Helton and Wilin Rosario -- the Nos. 3-7 hitters -- went a combined 12 for 21 and drove in all nine runs."We play very good at the house, and we play very good on the road -- it doesn't matter," said Rosario, who had a career-high four of those hits, including his fourth homer -- three of which have come versus San Diego.Gonzalez is 7 for 14 with six runs scored over the last four games in the series, while Tulowitzki is 7 for 16 with six RBIs in the four games he's played against the Padres. Colorado has never taken six straight from San Diego."It's nice winning this series after the first two games," manager Walt Weiss told MLB's official website. "Even though we won the series, try to get that game (Sunday), too."The Rockies now turn to Jorge De La Rosa (0-1, 6.10 ERA), who surrendered a three-run homer in the first inning of Monday's 4-2 loss at San Francisco before settling in. He threw five scoreless frames after that."Jorge is heading the right way. I think he's on the right path," Weiss said. "That's all we're looking for from our starters. I think Jorge is real close to being at his best."De La Rosa, who missed most of last season while recovering from Tommy John surgery, has gone 4-0 over his last five starts against the Padres despite a 5.04 ERA. Everth Cabrera, who finished a double shy of the cycle Saturday, is just 1 for 9 with six strikeouts against the left-hander, but Cameron Maybin is 3 for 4 with a homer.Mired in a 2-for-27 slump to start the year, Maybin received a day off Saturday but is expected to play in this game."Cam needs to take a couple steps back," manager Bud Black said. "The hitting coaches are working on some things to get him back on track and feeling good about his at-bats again. Hopefully that will translate to some base hits."Clayton Richard (0-1, 8.68) takes the hill for San Diego. The left-hander gave up eight hits and three walks in five innings Tuesday but managed to limit the damage, allowing two runs in a 9-3 victory over the Los Angeles Dodgers."We've worked on a lower arm slot in the spring, and I think he's starting to adjust to it," Black said. "Based on his bullpen (session) and the stride he made in his last outing, I believe Clayton will have a good start on Sunday."Richard has been hit hard over his last six starts against the Rockies, going 1/3 with a 7.29 ERA. Tulowitzki is 8 for 15 with three homers against him and Helton is 8 for 19. Fowler, though, is just 4 for 23 with six strikeouts.San Diego, which owns a major league-worst 5.55 ERA, has dropped four straight and seven of eight.