PHOENIX (AP) - The Oakland Athletics did so many things right - big hits, great defense.

Then one swing of the bat by Arizona's Ryan Roberts ruined everything.

Roberts' three-run home run off closer Brian Fuentes with two outs in the ninth inning gave the Diamondbacks a 9-8 victory over the A's in the opener of their three-game interleague series.

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For Fuentes, it was the worst episode in a series of recent difficulties. He has allowed seven runs in his last four games, over a span of 4 1-3 innings. Asked if Fuentes would continue to be the closer - Grant Balfour held the job earlier - Oakland manager Bob Melvin said, ``I don't make decisions like that two minutes after a game.'

Fuentes said he was ``struggling to keep the ball in the strike zone.'

``I lost my tempo or something towards the end,' he said, ``and couldn't locate my fastball, so I fell behind quite a bit. They are a good team. I didn't expect them to roll over in the second inning when we scored six runs.'

Last Sept. 27 - en route to the NL West title - Roberts' grand slam gave the Diamondbacks a wild come-from-behind victory over the Los Angeles Dodgers. This one, he said, was just as sweet.

``It's all the same, man,' he said, ``except for that was last year and this is this year. The feeling is just undescribable. It's awesome.'

Roberts, who also doubled twice, lined a 2-1 fastball into the seats in left field to give Arizona its only lead of the game.

``Oh my gosh, I was just trying to get a good pitch the whole at-bat,' Roberts said. ``I was just trying to get something to hit and not be the last out.'

J.J. Putz (1-3) pitched a scoreless ninth to earn the Diamondbacks' third straight win and fifth in six games.

Arizona tied a franchise record by rallying to win from a six-run deficit. The Diamondbacks have done it eight times, twice this season. They won for the first time this season after trailing through eight innings.

The A's had a season-high 16 hits but the offense wasn't enough for a team that came one swing from winning for the fourth time in five games after taking three of four from Texas.

Fuentes (2-2), who blew his third save in eight opportunities, walked Chris Young with two outs, then Aaron Hill singled to bring up Roberts.

Oakland's Seth Smith had three hits, including a two-run homer, and a spectacular, soaring catch at the bullpen fence in left catch to rob Hill of a home run.

Melvin said he didn't know Smith could jump that high.

``Check the scouting report I guess,' Smith said. ``I used to jump. I played basketball a long time ago but that was 10 years and 30 pounds ago.'

Paul Goldschmidt and Jason Kubel also homered for the Diamondbacks. Kubel finished with three RBIs.

Oakland chased Daniel Hudson while scoring six runs in the second inning, but the Diamondbacks scored three times in the bottom half, two on Kubel's booming home run onto the concourse in right-center.

Goldschmidt's shot just inside the left-field foul pole made it 6-4 in the fifth.

Both teams scored two runs in the sixth. Smith connected against ex-Oakland left-hander Craig Breslow, and Kubel doubled in Willie Bloomquist before scoring on Justin Upton's single.

Upton, back in the lineup after being benched for two games, went 2 for 4. Goldschmidt, who also singled, extended his hitting streak to 15 games.

Hudson was tagged for six runs and eight hits in 1 2-3 innings in his third start since returning from the disabled list after being sidelined with a right shoulder impingement.

Tommy Milone had a two-run single off Hudson for the first hit by an Oakland pitcher in 27 at_bats, dating to June 19, 2010, when Ben Sheets singled at St. Louis.

Brandon Inge led off the A's second with a single, then advanced to third on Kurt Suzuki's one-out single. In a 10-pitch at-bat, Cliff Pennington doubled in a run to leave runners at second and third with one out.

That brought up Milone, who slapped a single to left to make it 3-0. Coco Crisp added a two-out RBI double, Josh Reddick singled in a run and Inge had a run-scoring single in the second.

NOTES: Oakland's 16 hits tied a season high for an Arizona opponent. ... Hill also had two long outs to the fence in right. ... Milone's two-run single gave Oakland pitchers nine RBIs since interleague play began in 1997. ... The Diamondbacks activated 1B Lyle Overbay from paternity leave and optioned OF A.J. Pollock to Triple-A Reno. Overbay's wife, Sarah, gave birth to a girl, Audrey Lynn, on Tuesday. ... Saturday night's matchup features pitchers who were traded for each other in the offseason, Jarrod Parker (2-2, 2.40 ERA) for the Athletics and Trevor Cahill (3-5, 3.45) for Arizona.