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OAKLAND, Calif. (AP) -- Anthony Bass once again showed signs he is the same pitcher who started the season with such promise. He also showed he is still a work in progress.
Bass failed to get through the sixth inning for a fifth straight start as the San Diego Padres fell to the Oakland Athletics 10-2 on Friday night, snapping the team's season-high three-game winning streak.
"It's not fun," Bass said. "But I'm going to find a way out of it. It's tough when you're not going well."
Bass (2-7) has seen his ERA jump nearly two full runs over that span.
After allowing five of the first six hitters he faced to score, Bass set down nine of the next 10 hitters before the A's struck again in the fourth with two runs -- one earned.
"If you break it down with just his performance there are enough good things to keep him going," Padres manager Bud Black said. "At times he is major league quality and at other times there are things he needs to clean up."
Bass had an ERA of 2.89 following his last quality start, a no-decision, on May 20 against the Los Angeles Angels. He's given up 26 earned runs in 54 1-3 innings since, leaving Friday night's game with a 4.88 ERA.
"Confidence," Bass said. "When I have it I feel like I can get anyone out. Right now I feel like I've lost it."
He has also suffered some tough road starts lately, giving up 22 earned runs in his last four starts after allowing six in his first three.
Bass, who made his major league debut just over a year ago, has an 1.89 ERA in 24 appearances as a reliever. He was forced into the starting rotation because of injuries that thinned the Padres' staff.
"He's a tough kid," Black said. "He has good stuff. Through all of this there is experience being gathered. In the long run he will be better for it. His stuff is all there, it's a matter of putting pitches together."
Chris Denorfia extended his season-high hitting streak to eight games with an RBI single in the second.
Brandon Moss' two-run home run capped a five-run first inning and marked the sixth time in nine games that the A's first baseman has homered since being called up from the minors.
Josh Reddick and Cliff Pennington had two RBIs each for Oakland. The second-lowest scoring team in the American League going into the game, the A's have scored 36 runs in their last four games.
Travis Blackley (1-2) pitched six strong innings for his first win since July 1, 2004, when he made his major league debut with Seattle.
Carlos Quentin had two hits and an RBI for San Diego, which lost for just the second time in seven interleague games this season.
The Padres cut it to 5-2 when Alexi Amarista tripled and scored on Denorfia's single in the second.
Bass, who has not won since going eight innings to beat Washington on May 15, struck out three and was charged with nine runs, seven earned.
Bass walked the first two batters he faced then surrendered a two-out double to Reddick, three batters before Moss homered. He gave up two runs in the fourth then left after giving up consecutive one-out singles in the sixth.
Brad Boxberger replaced Bass but made a critical throwing error to center field after appearing to have easily caught Cowgill trying to steal second. Kurt Suzuki scored on the play and Cowgill later scored on Pennington's single.
NOTES: Oakland's 36 runs are its most over a four-game stretch since they scored 48 from June 6-9, 2004. ... Pennington celebrated his 28th birthday on Friday and has driven in at least one run on each of his last three birthdays. ... The umpiring crew of Tim McClelland, Brian Runge, Ted Barrett and Mike Muchlinski was the same one that worked San Francisco pitcher Matt Cain's perfect game on Wednesday. ... The A's signed their first-round draft pick, SS Addison Russell. The team has signed or agreed to terms with 23 of their 43 picks. ... RHP Ross Ohlendorf (1-0) will make his first start of the season Saturday for the Padres, making him the 12th starter San Diego has used already this year. That's the most since the 2009 team had 12 for the entire season. Oakland plans to call up RHP Tyson Ross (2-6) from Triple-A Sacramento to start opposite Ohlendorf. ... The Padres agreed to terms on a $3 million contract with LHP Max Fried of Harvard-Westlake H.S., the seventh overall pick in the amateur draft.
