The Padres, who lost to the Rockies, 6-2, on Wednesday, will have Thursday off before beginning a three-game series on Friday against the Phillies in Philadelphia.
Richard (1-4, 4.89 ERA), who is scheduled to start Friday's series opener, has been winless since his first start of the season.
He suffered his fourth consecutive loss Friday against the Miami Marlins, though it was his third quality start.
He allowed three runs, struck out a season-high seven and walked one in seven innings against the Marlins.
"The defense kept us in it," Richard said. "I made some pitches that got hit hard. It's disappointing I didn't come through ... but it's baseball."
After going 14-9 with a 3.75 ERA for the Padres in 2010, Richard slipped to 5-9, but with a 3.88 ERA in 2011.
Padres: Quentin about ready to return
The Padres are awaiting the return of left fielder and cleanup hitter Carlos Quentin, who has been rehabbing with Triple-A Tucson and Class A Lake Elsinore. Earlier this week, Quentin said he wouldn't rule out the road trip to Philadelphia.
The Padres could reinstate starting pitcher Tim Stauffer from the disabled list next week. Both Stauffer and Quentin were expected to play Wednesday with Lake Elsinore. It was expected to be Stauffer's final rehab outing before coming off the DL.
Phillies: Worley hoping to bounce back
Richard will be opposed by right-hander Vance Worley, who is 2-2 with a 2.84 ERA in six starts this season. Worley was roughed up by the Nationals for 11 hits and five runs in a losing effort in his last start Friday.
Philadelphia's relievers were tagged for eight runs (seven earned) in just three innings of work Wednesday to turn Cliff Lee's 4-2 lead into an eventual Mets rout. After posting a 2.01 ERA over the first 14 games, the Phils' bullpen has put up a 7.92 mark in the last 17.
After splitting a four-game set from April 19-22, this three-game series will be the last time these clubs meet this season. The Padres haven't won the head-to-head season matchup with the Phillies since 2006, when they won four of the six meetings.
The Phillies enter the series fresh off getting swept for the first time since Aug. 23-26, 2011.
Worley recorded a career-high 11 strikeouts against the Padres on April 19 in his only career outing against San Diego.