Dionini Ramon "Johnny" Guzmán Estrella (born January 21, 1971) is a Dominican former Major League Baseball pitcher. He played for the Oakland Athletics during the 1991 and 1992 seasons. He appeared in seven games, all as a relief pitcher.

This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (January 2011)

• Career statistics and player information from Baseball Reference, or Baseball Reference (Minors)

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