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OAKLAND, Calif. (AP) _ Oakland Athletics outfielder Jermaine Dye broke his left leg when he fouled a ball just below his knee Sunday, and was forced to leave Game 4 of the AL playoffs against the New York Yankees.

It was not immediately known whether Dye would be able to play again in this postseason.

With the runners on first and second and no outs, Dye's foul went straight down. The cleanup hitter's leg buckled when it was struck.

Dye fell to the ground, clutching his knee. An A's trainer and manager Art Howe rushed out of the dugout and the right fielder stayed down for several moments before he was carried into the clubhouse.

Dye was taken to nearby Alameda Hospital for X-rays and the fracture was discovered.

The A's led the best-of-five series 2-1 going into Sunday's game.

Dye was acquired by Oakland from Kansas City in a three-team trade on July 25, and the A's then went on a 48-14 tear. Dye had 59 RBIs in 61 games and provided needed protection for slugger Jason Giambi.

Dye was 3-for-12 in the AL division series with the Yankees.

Ron Gant finished out Dye's at-bat, striking out. Gant took over in right field.