To throw 9 pitches, 9 strikes, to retire the side does not happen very often in the major leagues. The feat has, to date (2016), been accomplished 81 times by 77 pitchers. Only 4 pitchers have done this twice. Only one pitcher, Sandy Koufax, has done it three times.
Only one pitcher has thrown 9 pitches and 9 strikes to retire a side once in the AL and once in the NL. Name that pitcher.
Trivia Question Answer
On April 14, 1968 Nolan Ryan, pitching for the New York Mets, retired the Houston Astros in the 3rd inning with 9 straight strikes. On July 9, 1972 he repeated this feat by retiring the Boston Red Sox with 9 strikes in the 2nd inning while pitching for the California Angels.