Claim: Federico Plummer made his professional debut, a sixth-round knockout of Sam Langford on May 23, 1947; then he won his first six fights before losing to Mike Ross in April 1948.
Evidence: Federico Plummer made his professional debut, a sixth-round knockout of Sam Langford on May 23, 1947. Plummer won his first six fights before losing to Mike Ross in April 1948.