I've heard that Nolan Ryan has the fastest official pitch timed at 100.9 mph. It's in the Guiness Book of Records. Bob Feller has said that he was timed at over 100 mph many times, I think 105 or 108? There have been many other pitchers that are thought to have hit the 100mph mark. Legend has it that a minor league lefty pitcher in the Balitmore Orioles organization in the late 50's named Steve Dalkowski had a fastball that was close to 110mph, but sadly he couldn't keep it in a batting cage. He was a drunk and was slightly mentally handicapped and he ended up injuring his arm the day he got fitted for his Major League uniform and was never the same after that. He never made it to the Majors. I don't know who's the fastest today, but I'd guess a guy like Billy Wagner or Bobby Jenks from the White Sox. What do you think?