Guillermo Moscoso of the Oneonta Tigers throws a perfect game against the Batavia Muckdogs. It is the first perfect game in the New York-Penn League in over 30 years and the first nine-inning perfect game in the circuit in 51 years.

On July 15, 2007 Guillermo Moscoso of the Oneonta Tigers throws a perfect game against the Batavia Muckdogs. It is the first perfect game in the New York-Penn League in over 30 years and the first nine-inning perfect game in the circuit in 51 years.

Source
Baseball Reference July 15