With more consideration, 20+ strikeouts might be up there too, hmmm...But I'm thinking it's either unassisted triple play or 20+ strikeout game for sure.
Strike out the side on 9 pitches has to be pretty rare. That and 4 strikeouts in an inning. Throwing a no-hitter and losing. A 1, 2, 3 inning by Carlos Marmol. Follow me https://twitter.com/LangeSportsmemo
I will NEVER forget the night I saw the Master Gred Maddux while a member of the Braves throw 3 (THREE) pitches in an inning at Chevez Ravine on a ESPN Wednesday night baseball telecast. I could not believe the third batter swung at the 1st pitch and popped it out.