Your list is excellent, but a lot of these are not underrated by the people who follow racing. In fact, they are appreciated. I don't think you shoud go strictly based on time.
BUT, the one I agree with most is #13- "Riboletta- 2000 Beldame. In a gigantic performance, the South American star would dispose of champion Beautiful Pleasure and run 9 furlongs in a strong 1:46 flat. Just 3/5ths off of Secretariat's track record, and 1/5th off of Go For Wand's Stakes record."
On her day, one of the fastest fillies around. Totally and completely underrated, mostly I feel b/c of her flop in the Breeders Cup when she was over the top anyway.
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