One of the most valiant sprint performances by a filly I ever witnessed was Xtra Heat in the Test Stakes on July 28th 2001
She got into a breakaway 3-way speed duel with Harmony Lodge and Secret Liaison at 7 furlongs at Saratoga ... had the race been 6.5f (you get a ton of run-up at that distance) the first quarter would have been 20 and change.
Notice how Xtra Heat's two pace rivals faired.
* Xtra Heat
* Harmony Lodge's Saratoga Form (21 Beyer)
* Secret Liason (-0 Beyer)
Future BC Sprint winner Orientate ran a 22 2/5 first quarter in a sharp wire-to-wire win at 6f that same day.