Opening Day is the day on which professional baseball leagues begin their regular season. For Major League Baseball (MLB) and most of the American minor leagues, this day typically falls during the first week of April, although in recent years it has occasionally fallen in the last week of March. In Nippon Professional Baseball, this day typically falls during the last week of March.

Robert William Andrew Feller, nicknamed "the Heater from Van Meter", "Bullet Bob", and "Rapid Robert", was an American baseball pitcher who played 18 seasons in Major League Baseball (MLB) for the Cleveland Indians between 1936 and 1956. In a career spanning 570 games, Feller pitched 3,827 innings and posted a win–loss record of 266–162, with 279 complete games, 44 shutouts, and a 3.25 earned run average (ERA). His career 2,581 strikeouts were third all-time upon his retirement.