Wrong information in the last paragraph. McNally was traded to Montreal after the 1974 season. He played the 1975 season without a contract and joined Andy Messersmith's case that year, even though he retired in May. Arbitrator Peter Seitz' decision in his favor came in December 1975, but McNally did not attempt to take advantage of his newly-obtained free agency.
Original text:
"After the Curt Flood case and a short players' strike in 1972 failed to resolve the free agency issue, McNally and Messersmith decided to test the reserve clause and played their 1974 seasons without a contract. After the season, arbitrator Peter Seitz declared both players free agents. McNally signed with the Expos, but won only three games while losing six and registering a 5.26 ERA, prompting his retirement."
Action taken:
Error fixed.
Revised text:
"After the Curt Flood case and a short players' strike in 1972 failed to resolve the free agency issue, McNally and Messersmith decided to test the reserve clause and played their 1975 seasons without a contract. After the season, arbitrator Peter Seitz declared both players free agents. McNally, who had announced his plans to retire during a dismal season with the Expos, did not take advantage of his newly-acquired free agency, while Messersmith signed a large contract with the Atlanta Braves."