Robert William Andrew Feller (November 3, 1918 – December 15, 2010), nicknamed "the Heater from Van Meter", "Bullet Bob", and "Rapid Robert", was an American baseball player who was a pitcher for 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.

A prodigy who bypassed baseball's minor leagues, Feller made his debut with the Indians at the age of 17. His career was interrupted by four years of military service (1942–1945) as a United States Navy Chief Petty Officer aboard during World War II. Feller became the first pitcher to win 24 games in a season before the age of 21. He threw no-hitters in 1940, 1946, and 1951, and 12 one-hitters, both records at his retirement. He helped the Indians win a World Series title in 1948 and an American League-record 111 wins and the pennant in 1954. Feller led the American League in wins six times and in strikeouts seven times. In 1946 he recorded 348 strikeouts, the most since 1904 and then believed to be a record.

An eight-time All-Star, Feller was ranked 36th on Sporting Newss 1999 list of the 100 Greatest Baseball Players and was named the publication's "greatest pitcher of his time". He was a finalist for the Major League Baseball All-Century Team in 1999. Baseball Hall of Fame member Ted Williams called Feller "the fastest and best pitcher I ever saw during my career." Hall of Famer Stan Musial believed he was "probably the greatest pitcher of our era." From the age of 15, he began to pitch for the Oakviews after a starting pitcher was injured; while doing so, Feller continued to play American Legion baseball. His catcher during this period was Nile Kinnick, who later won the Heisman Trophy in 1939 and became a member of the College Football Hall of Fame. He also was the starting center for the high school basketball team. Feller was assigned to the Fargo-Moorhead Twins and was to report there after finishing the high school semester. Feller elected to remain with the Indians but Henrich joined the New York Yankees. Sports columnist Joe Williams wrote, "For $7500 the Cleveland Indians received $500,000 [] worth of publicity. ... I feel pretty sure Mr. Alva Bradley, president of the Indians, will admit this is the cheapest investment he ever made in publicity."

Feller joined the Indians and made his Major League debut on July 19, 1936, in a relief appearance against the Washington Senators. A month later on August 23, Feller made his first career start against the St. Louis Browns. Indians manager Steve O'Neill had Denny Galehouse warmed up in the bullpen in case the 17-year-old Feller had early troubles, but he struck out all three batters he faced in the first inning, and recorded 15 strikeouts in earning his first career win. His strikeout total was the highest for a (starting) pitching debut. Three weeks later, he struck out 17 batters, tying a single-game strikeout record previously set by Dizzy Dean, in a win over the Philadelphia Athletics. He finished the season with a 5–3 record, having appeared in 14 games; he had 47 walks and 76 strikeouts in 62 innings. Feller's entrance to the big leagues was later described: