While they didn't have sole possession of second place in the NL West very long, the Colorado Rockies appear to have a good shot at getting back on track.
After dropping the first six meetings, the Padres (28-32) earned their first victory in the season series with a 6-5, 12-inning win Thursday at Coors Field.
Pinch-hitter Yasmani Grandal drove in the go-ahead run with a fielder's choice grounder in the 12th, though replays seemed to show he may have been out by a step.
"All that matters is that we got a run and we ended up winning,'' Grandal said.
It was a tough finish for the Rockies (32-29) after they had won four of five to move one-half game ahead of San Francisco for second place in the division. They're 2 1/2 games behind NL West-leading Arizona.
Colorado hopes to draw even in this series behind De La Rosa (7-3, 3.10 ERA), who is 5-0 with a 2.17 ERA in his last six starts.
De La Rosa has also won each of his five home starts with a 2.45 ERA and eight straight decisions dating back to his last loss at Coors Field on Sept. 26, 2010.
The left-hander improved to 5-0 with a 4.21 ERA in his last six starts versus the Padres by striking out seven and allowing two hits over six shutout innings in a 2-1 win at Petco Park on April 14.
Everth Cabrera is batting .441 during a seven-game hitting streak, but he's 1 for 12 with seven strikeouts lifetime against De La Rosa.
The Padres, who look to match a season high with their third straight road win, counter with struggling Edinson Volquez (4-5, 5.35).
Since going 3-0 with a 2.59 ERA over a five-start stretch, Volquez is 1-2 with a 5.70 ERA in his last four outings. He has 24 strikeouts but also 11 walks over his last 23 2-3 innings.
The right-hander allowed four runs and six hits over five innings before leaving without a decision in a 7-4 loss to Toronto on Sunday. Volquez did hit his first career homer - a three-run shot.
The Rockies haven't been a good matchup for Volquez, who has been tagged for 11 runs and 15 hits over 9 1-3 innings in a pair of losses to them this season.
Catcher Wilin Rosario, who hit a game-tying two-run homer in the eighth inning Thursday, is 5 for 12 with two home runs lifetime against him.
Carlos Gonzalez has seven hits - three doubles - in 14 at-bats when facing Volquez the past two seasons.
Gonzalez and Troy Tulowitzki had been hitting a combined .400 in the season series before going 0 for 11 in Thursday's loss.
"Your three and four guys aren't going to tear it up every night,'' manager Walt Weiss said. "It won't happen that way.''
Rockies center fielder Dexter Fowler hasn't started the last two games due to an illness, but could return to the lineup Friday.
San Diego's Cameron Maybin had two hits, two RBIs and two stolen bases in his return Thursday after missing 45 games with a right wrist injury.
Teammate Chase Headley is hitting .414 over his last 15 games in Colorado.