On August 19, 1942, wearing his brother Walker's number 15, Mort Cooper won his 15th game of the season, as he went the distance in a 5-1 victory over the Chicago Cubs at Sportsman's Park. The hurler usually wore the number 14, however, on this day he asked his little brother who would be catching him to swap him out jerseys, and Walker quickly obliged. The number change did not affect the backstop, as he joined Enos Slaughter in the home run department en route to victory. Mort scattered seven hits in the contest, and looked like he was gonna get a shutout until the Cubs plated a run in the eighth. The eventual 22 game winner settled for the 5-1 complete game win, as he helped the club march toward the National League pennant.
Check out the box score here: http://www.baseball-reference.com/boxes/SLN/SLN194208190.shtml