Josh Gibson began his career at Ammon Field in 1929 while playing with the Pittsburgh Crawfords, and continued playing there, as the Crawfords and Homestead Grays regularly played at Ammon. Known as the "black Babe Ruth," Gibson was a leading home run hitter until his death from a stroke in 1947 at age 35. In 1972, he became the second Negro leagues player inducted into the Baseball Hall of Fame.

Originally a youth semi-pro team, the Crawfords eventually played at Ammon Field, earned a strong reputation and attracted games with many white teams. W.O.W., the defending champions of the white Greater Pittsburgh Semipro Tournament, played the Crawfords at Ammon on June 15, 1930. Although usually covering on the fully professional Homestead Grays, the Pittsburgh Courier reported the 9–8 Crawfords victory.

Grays owner and manager Cum Posey recognized the Crawfords competition with his own team and sought to undermine their appeal. In 1929, he persuaded Crawfords manager Hooks Tinker to take on his older brother Seward "See" Posey as a part-time assistant and booker. While admission to the Crawfords amateur games were free by law, at one tournament in 1930, See Posey closed all but one gate to the park and required fans to make contribution, with two police officers stationed at the gate. After the game, he brought Tinker a burlap bag with $2000 in small bills. The Posey brothers were also able to lure Gibson to play with the Grays.

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