The 25-year-old right-hander faced Upton again in the second, giving up a bases-loaded double that scored two more runs. In all that time, Los Angeles Dodgers manager Don Mattingly had no one warming up in the bullpen — not even after Frias surrendered a leadoff homer in the third inning en route to an 11-3 loss to the San Diego Padres on Sunday.
"Carlos has gotten himself out of a couple of those (jams) this year where he recovered. This time he didn't recover," Mattingly said. "But this could happen to anybody. You get yourself in bad counts, sometimes you pay for it. Sometimes you don't, and they pop it up."
It wasn't until Frias gave up back-to-back singles to open the fifth that Mattingly went out and got him after 69 pitches. By then the damage was done: 10 runs and 12 hits.
"He came to me and told me: 'Let the first two innings behind, turn over the page and start again.' That showed me that they had confidence in me," Frias said. "They know I can compete out there. I had a bad day today, but I'm putting that behind me."
Frias (3-2) put himself in the Dodgers' record book alongside Brad Penny, Tom Candiotti, Chan Ho Park, Carlos Perez and Odalis Perez as the only starting pitchers to give up as many as 10 runs in a start since the franchise moved to Los Angeles in 1958. Penny was the last one to do it, on May 7, 2008, against the New York Mets.
Upton's two bases-loaded hits provided a boost to an offense that entered Sunday 4 for 29 in those situations. Upton had batted only one other time this season with the bags full and hit a sacrifice fly.
"I don't think we cared how we got our runs today. But it was nice to get some runners in scoring position, get the bases loaded and get some hits in those situations," said Upton, who was ejected for arguing balls and strikes on Saturday night while the Padres were being held to one hit by Mike Bolsinger and Kenley Jansen in a 2-0 loss.
The Dodgers scored three in the seventh against unbeaten James Shields, which made the loss slightly less humiliating for a first-place team that has totaled just nine runs over its last eight games.
Shields (6-0) became the first Padres starter to win his first six decisions since 1985, when Andy Hawkins began 11-0. Shields, who also went 6-0 over his first 13 starts in 2007 season with Tampa Bay, signed a five-year contract with San Diego as a free agent in February after helping the Kansas City Royals win the AL pennant.
This was the second time that Shields' teammates have given him double-digit run support.
"I'll take that every start," the veteran right-hander said. "When you get an early lead like that, you've still got to bear down and keep making your pitches. That team over there is too dangerous to take lightly. Today I threw a lot of fastballs and mixed in my other pitches pretty well. But as long as I get outs, I don't care what I'm throwing."
Jimmy Rollins' one-out single on the first was the Dodgers' only hit until the seventh, when they opened the inning with three consecutive singles and Rollins scored on a double-play grounder by Andre Ethier. Rookie Alex Guerrero followed with a two-run homer off Shields, who has given up a major league-worst 15.
Upton's grand slam was the first against the Dodgers since Sept. 14, 2013, when Hunter Pence victimized Stephen Fife.
The Padres, coming off their sixth shutout loss in a span of 18 games, extended their lead to 8-0 with Upton's clutch double inside third base and Derek Norris' two-run single through a drawn-in infield. Shields started the rally with a leadoff single.
Padres: RHP Brandon Morrow, who hasn't pitched since May 2 because of inflammation in shoulder, threw 45 pitches during a bullpen session and is scheduled to pitch a simulated game sometime this week. ... 1B Yonder Alonso, is scheduled to begin a minor league rehab assignment this week after missing 15 games with a bruised right shoulder.
Dodgers: C Austin Barnes made his major league debut, one day after Yasmani Grandal went on the seven-day concussion disabled list. Grandal, injured in Friday night's series-opening 2-1 victory, is expected to be activated after a minor league rehab stint that will last two or three games.
Dodgers: LHP Brett Anderson (2-2) takes the mound against RHP Williams Perez on Monday night in the opener of a three-game set with Atlanta.
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