After trailing 8 – 2 with two outs in the 8th inning, Mike Piazza’s tie-breaking three-run homer completes a 10-run miracle comeback as the Mets stun the Braves, 11 – 8. Nine of the runs are driven in with two outs and the ten runs equal the most ever scored in an inning by the Mets.

On June 30, 2000 After trailing 8 – 2 with two outs in the 8th inning, Mike Piazza’s tie-breaking three-run homer completes a 10-run miracle comeback as the Mets stun the Braves, 11 – 8. Nine of the runs are driven in with two outs and the ten runs equal the most ever scored in an inning by the Mets.

Source
Baseball Reference June 30