On July 15, 1997 Visiting San Francisco scores 13 runs in the 7th inning – the most in the National League since the Dodgers scored 15 in the 1st inning against the Reds in 1952 – to coast to a 16 – 2 win over the Padres. The Giants send 19 men to the plate in the 7th and face 80 pitches in the 52-minute inning. They score seven runs before J.T. Snow grounds out for the first out. Five Giants score two runs each, including starting pitcher Kirk Rueter (6-4). The only player not to score is Snow, who Ks with the bases loaded for the second out.
Source
Baseball Reference July 15