Truett Banks "Rip" Sewell was a right-handed starting pitcher in Major League Baseball who played 13 years in the major leagues with the Detroit Tigers (1932) and Pittsburgh Pirates (1938–1949). Sewell was selected four times to the National League All-Star team (1943–1946) and is credited with inventing the "Eephus pitch."

An eephus pitch in baseball is a very high-arcing off-speed pitch. The delivery from the pitcher has very low velocity and often catches the hitter off-guard. The eephus pitch is thrown overhand like most pitches, but is characterized by an unusual, high-arcing trajectory. The corresponding slow velocity bears more resemblance to a slow-pitch softball delivery than to a traditional baseball pitch. It is considered a trick pitch because, in comparison to normal baseball pitches, which run from 70 to 100 miles per hour, an eephus pitch appears to move in slow motion at 55 mph (89 km/h) or less, sometimes as low as 35 mph (56 km/h).