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