I cannot name exact people, but as far as general knowledge, I've seen hard breaking curve-balls in the mid eighties. Pitchers don't try to overthrow a curve because the chance of it going wild or injuring their arm goes way up.
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Most pither's Curveball's are thrown slower then there fastballs. Usually about 10 mph slower. so if a major league pitcher throws a 95 mph fastball the curveball would be about 85. However there are some pitchers whose curveball's go the same speed as their fastball.