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09/13/09 1:51 AM ET

Padres getting mileage out of Richard

San Diego (64-79) vs. Colorado (82-61), 1:05 p.m. PT

SAN DIEGO -- While the Chicago White Sox are still waiting for Jake Peavy to make his first official pitch for the team, the Padres are getting plenty of mileage out of one of the four pitchers they obtained in the trade with the White Sox on July 31.

Clayton Richard, who gets the start Sunday for the Padres in the final game of a three-game series with the Rockies at PETCO Park, will make his ninth start for the team and his first against Colorado.

Richard is 4-2 with a 5.40 ERA in eight starts and has shown promise at times and has struggled at others.

Richard was hit hard in his last start for the Padres on Monday in San Francisco, allowing six runs on eight hits with two home runs in what would become a 9-4 Giants victory.

"The pitches that were hit hard were fastballs. I left some over the plate and they made the most of them," Richard said. "Really, it was just a couple of mistakes."

Richard didn't have much in the way of secondary pitches against the Giants and couldn't bury his sinker nearly enough to avoid trouble. He'll hope to regain a grip on those pitches on Sunday.

Richard is one of three pitchers in the deal who are on the Padres roster. Reliever Adam Russell is 1-0 with a 1.29 ERA in eight games for the Padres. Another pitcher, Aaron Poreda, considered the prized arm in the deal, just joined the team last week.

There's no timetable as to when Poreda, a left-hander, will pitch. The Padres are working with him on getting back to mechanics and a delivery he's more comfortable with after struggling at Triple-A Portland after the trade.

Pitching matchup
SD: LHP Clayton Richard (8-5, 4.88 ERA)
Richard will make his first career start against Colorado.

COL: RHP Jason Marquis (15-10, 3.65 ERA)
Marquis held the Reds to one run and four hits in 7 1/3 innings and set a season high with seven strikeouts in a 3-1 victory on Tuesday night. In the victory, Marquis' signature sinker was not consistent, but he had extreme downward tilt on the slider and he faced Reds hitters who couldn't make the adjustment. The Padres haven't had much luck with him, either. He is 2-0 with a 0.56 ERA in two starts against them this season.

The Padres haven't announced a starter for Wednesday against the D-backs, though it could well be right-hander Edward Mujica, who tossed four shutout innings on Friday in a spot start for rookie Mat Latos, who is done for the season as the team didn't want him to throw any more innings. "Mujica didn't do anything for us to think he can't make [another] start," Padres manager Bud Black said. Black said there was no reason that if Mujica gets the start that he can't throw upwards of 70-80 pitches. The other candidate is left-hander Cesar Ramos, who has yet to make his Major League debut. ... Black said Saturday that pitchers Mike Adams (strained right shoulder) and Greg Burke (sore right shoulder), both right-handers, will throw off the mound prior to Sunday's game against the Rockies. Both figure to return some time before the end of the regular season. ... Latos is done pitching in games but he's still working with pitching coach Darren Balsley on the side. Latos threw a bullpen session on Saturday. The team wants to look at his mechanics and possibly lengthen his stride and continue to help the 21-year-old refine his pitches.

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On the Internet
 Gameday Audio
•  Gameday
•  Official game notes

On television
• 4 San Diego

On radio
• XPRS 1090, XEMO 860 (Español)

Up next
• Monday: Padres (Kevin Correia, 10-10, 4.30) vs. D-backs (Billy Buckner, 2-6, 7.38), 7:05 p.m. PT
• Tuesday: Padres (Wade LeBlanc, 2-1, 5.01) vs. D-backs (Dan Haren, 13-8, 2.82), 7:05 p.m. PT
• Wednesday: Padres (TBD) vs. D-backs (Doug Davis, 7-13, 3.99), 12:35 p.m. PT

Corey Brock is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.