Wilfred Charles "Sonny" Siebert (born January 14, 1937 in St. Mary, Missouri, United States) is a former Major League Baseball pitcher from 1964 to 1975. He finished with a record of 140-114 and a 3.21 ERA. He threw a no-hitter on June 10, 1966 against the Washington Senators. He was originally drafted simultaneously by the Cleveland Indians and the St. Louis Hawks of the NBA.
|Born: January 14, 1937|
St. Mary, Missouri
|April 26, 1964, for the Cleveland Indians|
|Last MLB appearance|
|September 25, 1975, for the Oakland Athletics|
|Earned run average||3.21|
|Career highlights and awards|
Siebert attended Bayless Senior High School, and the University of Missouri and played on the 1958 team that lost in the College World Series finals in 12 innings. He was selected to the CWS All Tournament Team that year.
Originally an outfielder, Siebert related that the Indians had a scout following him during his college days. He was newly married, and the team flew Siebert and his wife to Cleveland, where he worked out on the field before games. During the afternoons before games, Rocky Colavito showed them around Cleveland.
Siebert signed with the Indians, and it was several years into his minor league career that Siebert convinced the Indians' front office to let him try pitching. It was a move that paid off handsomely for the Indians and for Siebert, who posted 16 wins in both 1965 and 1966. He authored a no-hitter in 1966, and was third in the American League in ERA in 1967. Siebert had a 12-10 record in his final full year in Cleveland, in 1968.
Siebert is the last American League pitcher to hit two home runs in one game, accomplishing the feat as a member of the Boston Red Sox on September 2, 1971 against the Baltimore Orioles. On September 11, 1974, he was credited with the win in a 25-inning Cardinal win over the New York Mets. It is the second longest game in innings played in National League history. 
- Career statistics and player information from Baseball-Reference, or Baseball-Reference (Minors), or Retrosheet
- Sonny Siebert at Baseball Library
| No-hitter pitcher
June 10, 1966
Steve Barber & Stu Miller
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