An infield single by Johnny Blatnik of the Phillies in the 7th prevents a perfect game by Harry Brecheen of the Cardinals. Brecheen will become the National League ERA leader with 2.24 and the winning percentage leader on a 20-7 record. The Cards win, 5 – 0, and Brecheen scores his third straight shutout.

On May 8, 1948 — An infield single by Johnny Blatnik of the Phillies in the 7th prevents a perfect game by Harry Brecheen of the Cardinals. Brecheen will become the National League ERA leader with 2.24 and the winning percentage leader on a 20-7 record. The Cards win, 5 – 0, and Brecheen scores his third straight shutout.

Source:
Baseball Reference May 8