SAN DIEGO -- Jhoulys Chacin wanted revenge against his former team on Saturday night. He got that and the San Diego Padres clinched the series as Chacin beat the Colorado Rockies 5-0 with six effective innings.

The fading Rockies' lead over the Milwaukee Brewers was shaved to one game for the second National League wild-card spot as Colorado managed but five hits.

Chacin (13-10) surrendered a hit and three walks to his ex-team and struck out six in winning his fourth straight start at Petco Park. He beat the Rockies for the first time in three starts this year as they were shut out for the third time in four games -- a franchise first.

"Today was that little extra for me, facing my former club and my last start at home,'' Chacin said. "I really wanted to do good and finish the season strong, especially at home.''

The Rockies' lineup has gone quiet at the wrong time. Colorado stranded nine and was 0-for-6 with runners in scoring position and didn't have an extra-base hit for the second game of the series.

"I wish I had the answer,'' Rockies manager Bud Black said of his team's malaise.

Four Padres relievers, with Brad Hand pitching the ninth, finished off the Rockies as they fell for the fifth time in six games.

Chacin took a no-hitter into the sixth before DJ LeMaieu's sinking line drive just escaped the diving Manuel Margot's attempt.

"At some point in time it starts creeping into your mind what's going on but it needs to go deeper before it gets too dramatic,'' Padres manager Andy Green said of Chacin's no-hit bid. "Manny made a great effort to try to take it away. I think it unseated Jhoulys for a couple of batters but he settled back in.''

Chad Bettis (1-4) lost for the third time in his last four decisions. He lasted 4 2/3 innings and gave up a run and seven hits with two walks. He struck out three.

"I thought his velocity was up and he mixed in the curveball,'' Black said. "He kept the ball down.''

The Padres added three runs in the eighth, with Ian Desmond's throwing error accounting for one of the runs. The RBIs came from pinch-hitter Erick Aybar and Manuel Margot.

The Rockies, trailing 2-0, threatened against reliever Craig Stammen after Chacin's exit.

Desmond and Jonathan Lucroy produced one-out singles, but Stammen struck out pinch-hitter Raimel Tapia before southpaw Buddy Baumann came on to face the left-handed-hitting Charlie Blackmon. Baumann fanned the NL's batting leader to halt the rally.

"We're not making good contact overall,'' Black said. "Even though tonight we had some guys on base, we couldn't get the big hit again and that has been the common theme, that at-bats have not resulted in not a lot of hard-hit balls consistently."

Chacin, who tied Clayton Richard with his team-high 31st start, got out of a first-inning jam after LeMahieu walked and Nolan Arenado reached on an error by second baseman Carlos Asuaje. Chacin retired Gerardo Parra on a flyout to end the inning.

Bettis had to tiptoe around trouble with runners reaching base in each of the first five innings. He was bitten in the fifth when the Padres chased him after 85 pitches on Yangervis Solarte's RBI single as the Padres took a 1-0 lead.

The way the Rockies are scuffling, it might as well been a 10-run advantage.

"There is no reason to change now as a team, and individually, a lot of guys have had a lot of success this year,'' Desmond said. "We just need to stick with it and keep on grinding it out.''

NOTES: Rockies LHP Kyle Freeman will continue to pitch out of the bullpen, although he could get a spot start next weekend against the Dodgers. ... Padres LF Travis Jankowski started in left field, which has been the case against right-handed starters. ... CF Manuel Margot was thrown out attempting to steal, which snapped his streak at 10 straight stolen bases. He did extend his hitting streak to seven games.