After the first two Cubs get on base in the bottom of the ninth inning at Wrigley Field, Phillies rookie right-hander Robin Roberts appears to pitch out of trouble by getting the next two batters out. The 21 year-old hurler and future Hall of Famer, however, proceeds to hit the next two consecutive batters, Phil Cavarretta and Andy Pafko, with a pitch, giving Chicago a 3-2 walk-off victory.

On July 18, 1948 — After the first two Cubs get on base in the bottom of the ninth inning at Wrigley Field, Phillies rookie right-hander Robin Roberts appears to pitch out of trouble by getting the next two batters out. The 21 year-old hurler and future Hall of Famer, however, proceeds to hit the next two consecutive batters, Phil Cavarretta and Andy Pafko, with a pitch, giving Chicago a 3-2 walk-off victory.

Source:
Baseball Reference July 18