I know these are a while back but,
Artsplace winning the Cane pace at YR.
Pershing Square at RR.
Dragons Lair at RR.
I know the bottom two weren't world beaters but they were very impressive in this respect.
On nights when the average race was finished in about 202 they both ran eye popping sub 156 miles, at the time that was eye popping at a 1/2 mile.