Fallon played baseball at Hollywood Hills High School in Hollywood, Florida where he was teammates with Bill Lindsey, who would also go on to play for the White Sox.
He was drafted by the White Sox in the 1st round (15th pick) of the secondary phase of the 1979 amateur draft. Fallon played his first professional season with their Class-A (Short Season) Niagara Falls Pirates in 1979, and his last with the Detroit Tigers' Double-A Glens Falls Tigers and Triple-A Nashville Sounds in 1986.

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