This Day in Baseball June 17 - Zip Relief

Cubs right-hander reliever George Washington Zabel, called into the game with two outs in the bottom of the first inning, throws 18 and 1/3 innings of the Cubs’ 4-3 victory over the Robins at Chicago’s West Side Park. ’Zip,’ establishing the major league record for the longest relief stint in one game, beats Brooklyn starter Jeff Pfeffer, who tosses a 19-inning complete-game. — thisdayinbaseball.com

The ThisDayinBaseball.com website provides dozens of June 17 events including this gem:
1915 - Cubs right-hander reliever Zip Zabel pitches 18 innings in relief.