Washington defeats Pittsburgh, 14 – 9, in a beanball battle. Senators pitcher Win Mercer hits three Pittsburgh batters while Pirate Pink Hawley plunks three Washington batters in a disastrous 11-run 7th inning, tying a mark he set on July 4, 1894. Hawley retires in 1900 after only nine seasons with a still-standing National League record of 195 hit batters. All told, eight batters are plunked in the contest, a National League-record five by Hawley. The five Washington batters hit by pitches ties the NL mark and won’t be matched till July 2, 1969.

On May 9, 1896 — Washington defeats Pittsburgh, 14 – 9, in a beanball battle. Senators pitcher Win Mercer hits three Pittsburgh batters while Pirate Pink Hawley plunks three Washington batters in a disastrous 11-run 7th inning, tying a mark he set on July 4, 1894. Hawley retires in 1900 after only nine seasons with a still-standing National League record of 195 hit batters. All told, eight batters are plunked in the contest, a National League-record five by Hawley. The five Washington batters hit by pitches ties the NL mark and won’t be matched till July 2, 1969.

Source:
Baseball Reference May 9