At the Minnesota Twins Metrodome on july 3rd 2009, the Detroit Tigers Joel Zumaya threw a pitch that was registered at 105. It was in the bottom of the 10th inning i believe (although it may have been the bottom of the 11th, the innings tend to blend into each other in a 16 inning game). It has yet to be "officially" verified (and thus placed among the record books). He registered 1 other pitch at 104 and several more at 103. I personally watched the game and as a Tigers fan, have seen him pitch in about 85% of his games. On a side note, I was at the TIgers-Astros game on 06-27-06 when Zumaya threw 103 in the top of the 8th 3 times. Interestingly, Roger "The Rocket" Clemens started for Astros, and hit 97 mph once, but that pitch looked like a change up in comparison to Zumaya's fastballs. Seeing a fast pitch on TV does NO justice to witnessing that speed in person.
Read more: What is the fastest pitch ever thrown in MLB by a pitcher? | Answerbag
What is the fastest pitch ever thrown in MLB by a pitcher? | Answerbag