With all due respect to Shrewd Operator, he won one race on his favorite surface in 2011. He was a distant 6th in the lightning jet. River bear was mr. consistant on dirt and poly. Dusted the field in the holiday cheer in December. Lost on a head bob in one Illinois stakes and by 1 length in another to a horse carrying 11 pounds less than him. I gotta go with River Bear for male sprinter.