Darold Duane Knowles (born December 9, 1941) is an American former professional baseball pitcher and coach, who played in Major League Baseball (MLB) from through , most notably as a member of the Oakland Athletics dynasty that won three consecutive World Series championships between and . In the 1973 World Series, Knowles became the first pitcher to appear in all seven games of a World Series. He also played for the Baltimore Orioles, Philadelphia Phillies, Washington Senators / Texas Rangers, Chicago Cubs, Montreal Expos, and St. Louis Cardinals. Knowles batted and threw left-handed. In 2014, he was hired as the pitching coach of the Florida State League's Dunedin Blue Jays. Playing career Baltimore Orioles Knowles attended Brunswick High School, then signed with the Baltimore Orioles in after attending the University of Missouri. He spent four seasons in their farm system, going 45–28 with a 2.83 earned run average (ERA), mostly as a starter. Knowles made his debut with the Orioles on April 18, 1965, pitching 1.2 innings out of the bullpen, and giving up five earned runs before returning to the triple A Rochester Red Wings. Upon completion of the International League (IL) season, Knowles received a September call back up to Baltimore. He went 0–1 with a 6.92 ERA in his return. The loss came against the Detroit Tigers, in Knowles’ only start. Philadelphia Phillies Knowles was traded with Jackie Brandt to the Phillies for Jack Baldschun on December 6, 1965. He won the season opener against the St. Louis Cardinals, pitching six innings of one-run ball to earn his first career win. His first career save came on May 12 against the Los Angeles Dodgers. For the season, Knowles earned 13 saves. His 69 appearances, all in relief, were the third highest total of any pitcher in the league. At the end of his only season in Philadelphia, he was traded to the Washington Senators for Don Lock. Washington Senators Knowles began earning a reputation as a work-horse relief pitcher, as he was used 61 times by manager Gil Hodges in . He was used 32 times in when his season was cut short by President Lyndon B. Johnson's reserve call-up of the USAF's 113th Tactical Fighter Wing in which he was an airman first class. He returned to the Senators in May , and went 4–1 with four saves and a 2.01 ERA to earn his only