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Oakland Athletics relief pitcher Brian Fuentes throws to the Los Angeles Angels during the eigth inning of a baseball game in Anaheim, Calif., Monday, May 23, 2011. (AP Photo/Chris Carlson)

ANAHEIM -- The A's have a six-game losing streak on their hands.

They've also got a serious rift brewing between manager Bob Geren and interim closer Brian Fuentes.

Fuentes blasted Geren after Monday night's 4-1 loss to the Los Angeles Angels, in which Fuentes (1-7) faced two hitters in the eighth inning and took his fourth loss in his past four appearances. His seven losses lead all American League relievers.

Fuentes talked before the game about his frustration over being brought into a tie game in extra innings Sunday against the Giants, an unusual occurrence for a closer in a road game.

On Monday, he was called upon to relieve Josh Outman to start the eighth inning. He said he was shocked when the phone rang in the seventh inning and his name was called.

"I thought the games in San Francisco were some unorthodox managing, but I thought it was maybe the National League, maybe that had something to do with it," Fuentes said. "But tonight was pretty unbelievable."

Fuentes, who has 196 career saves and is filling in for injured closer Andrew Bailey, was asked his thoughts on how he's being handled in the bullpen.

"Pretty poorly," he replied.

How much communication does he have with Geren?

"Zero."

Fuentes, an 11-year veteran, said he didn't know if other relievers felt this way. But he added:

"There's just a lack of communication. I don't think anybody really knows which direction he's headed."

It's by far the biggest verbal jab a player has taken on the record at Geren in his four-plus seasons managing the team. The A's are 22-26 and in last place.

They were tied 1-1 when Fuentes relieved Outman, who turned in seven innings of stellar work. Fuentes walked leadoff man Erick Aybar and got Bobby Abreu to hit into a fielder's choice.

Geren then replaced Fuentes with Michael Wuertz, who allowed Torii Hunter's go-ahead double and then a two-run single to Jeff Math.

Geren has made plenty of curious bullpen moves over the years that have invited scrutiny. He's said before that he doesn't like putting relievers in any one certain role but would rather have guys ready to be called on whenever needed.

"I could use anybody late in the game," Geren said. "It's been that way, everybody knows that. If there's a certain part of the lineup (that's good) to use (Fuentes) earlier, I'll use him earlier."

He also indicated he's reluctant to use unproven pitchers in crucial late-inning situations.

"He should share those comments with us rather than with you guys," said Fuentes, who has a 5.06 ERA and entered Monday tied for fourth in the AL with 22 appearances.

The A's mustered eight hits off three Angels pitchers but scratched out just a third-inning run.

Coco Crisp doubled in the third and came around to score on Hideki Matsui's sacrifice fly.

With Kevin Kouzmanoff sidelined by a groin strain and Andy LaRoche spelling Mark Ellis at second base, outfielder Conor Jackson made his first professional start at third base.

Jackson had made two appearances at third this season as a late-game substitute, and he's been taking grounders there during batting practice for the past month.

Reliever Jerry Blevins was designated for assignment to make roster room for Outman, but Blevins is reporting to Triple-A Sacramento and will remain with the organization.