PHOENIX (AP) - San Francisco manager Bruce Bochy offered a succinct description of the loss that eliminated the defending World Series champions from postseason contention.

``It was just a very ugly game,' he said.

Eric Surkamp failed to make it out of the first inning and the Giants went on to a 15-2 loss to the Arizona Diamondbacks on Saturday night.

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Surkamp issued four of San Francisco's 13 walks, which matched a franchise record. The left-hander recorded just two outs and was charged with six runs and three hits.

``This one started bad and got worse,' Bochy said. ``We walked 13 guys and that should not happen.'

Ian Kennedy pitched six innings to earn his NL-best 21st win and Gerardo Parra had four RBIs for the Diamondbacks, who scored six times in the first and tied their single-highest scoring game of the season. Ryan Roberts drove in three runs.

Arizona also matched a franchise record with 13 walks one night after it beat San Francisco 3-1 to clinch the NL West title. The Diamondbacks also had 13 walks in a 13-inning game against the Houston Astros on June 5, 2002.

San Francisco was eliminated from the wild-card race with the loss. The Giants fell behind Arizona when they lost to Pittsburgh on Aug. 10 and never regained first place in the division.

Kennedy (21-4) allowed two runs and five hits, struck out four and walked two while throwing 86 pitches. The right-hander is 6-0 with a 1.66 ERA in his last seven starts.

``I felt I did my job and knew my pitch count would be held down,' he said. ``I was around 85 and I guess if the game was closer, I would have stayed in longer. It was nice to get the offense going, and happy I was able to contribute.'

The Diamondbacks remained one game back of Milwaukee for the second-best record in the National League, with home-field advantage for the first round of the playoffs at stake.

Arizona jumped out to a quick lead. Roberts and Parra each had a two-run single, and Kennedy capped the big first inning with a two-run double.

Surkamp (2-1) has issued 15 walks in 22 innings in his rookie year.

``I've been erratic with my control since I got here,' he said. ``I felt good in the bullpen warming up, but couldn't throw strikes. I can't be walking guys and giving up six runs. It's hard to win when you don't throw strikes.'

The Giants experienced some bad luck on Parra's hit, with second baseman Mike Fontenot running into second base umpire Bruce Dreckman. The collision allowed the routine grounder to go into center field, scoring Paul Goldschmidt and Roberts.

The Diamondbacks added five more runs in the sixth, and the rout was on. Roberts had another run-scoring single, lumbering catcher Henry Blanco tripled home a run and pinch-hitter Sean Burroughs added an RBI single for an 11-2 lead.

Pablo Sandoval had two RBIs for San Francisco, which allowed a season high for runs.

The Diamondbacks improved to 92-66, tying for the third-most victories in franchise history. They won 100 in 1999 and 96 in 2002.

NOTES: With the Diamondbacks batting in the bottom of the seventh, Chase Field experienced a power failure. Play resumed after a delay of 27 minutes. ... Diamondbacks manager Kirk Gibson announced starter Jarrod Parker, the team's top draft pick in 2007, will make his major league debut Tuesday against the Dodgers. ... Blanco's triple was the 11th of his career and his first since Sept. 10, 2006, with the Chicago Cubs. ... When the Giants return home Monday, they will set an single-season franchise attendance record. In 2011, they sold 3,261,104 tickets, and will sell out every game. ... Tim Lincecum (13-13, 2.59 ERA) will start for the Giants on Sunday, and Josh Collmenter (9-10, 3.42 ERA) will pitch for Arizona. ... The crowd of 49,076 was the third sellout of the season for the Diamondbacks.