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Louie Espinoza knocked out challenger Mike Ayala...

Louie Espinoza knocked out challenger Mike Ayala in the ninth round at San Antonio to retain his World Boxing Assn. junior-featherweight title.

Espinoza (43-1), of Phoenix, was leading on all cards when the knockout came 37 seconds into the round.

Ayala (44-6), fighting in his hometown, has lost all three of his title shots in an eight-year career.

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