Robert Ransom Rush was an American professional baseball pitcher who appeared in 417 games in Major League Baseball from 1948 to 1960 for the Chicago Cubs, Milwaukee Braves and Chicago White Sox. He threw and batted right-handed, stood 6 feet 4 inches (1.93 m) tall and weighed 205 pounds (93 kg). Rush was a National League All-Star selection in 1950 and 1952. Although he was a starting pitcher for the Cubs for ten seasons, and worked in 339 total games for them, he did not reach the postseason until he was a Milwaukee Brave, when he appeared in the 1958 World Series.

The 1958 World Series was the championship series in Major League Baseball for the 1958 season. The 55th edition of the World Series, it matched the American League champion New York Yankees and the National League champion Milwaukee Braves. In a reversal from 1957, the Yankees defeated the Braves in seven games to win their 18th title, and their seventh in 10 years. With that victory, the Yankees became only the second team in Major League Baseball history to come back from a 3–1 deficit to win a best-of-seven World Series; the first was the Pittsburgh Pirates in 1925. These teams would meet again in the fall classic 38 years later—by that time, the Braves had moved to Atlanta. As of 2024, this is the most recent World Series featuring the two previous Series winning teams.