California-based Umberto Rispoli was set to ride Amerman Racing's Endlessly (Oscar Performance) in the GI Kentucky Derby about three hours later, and he got the partnership off to a fortuitous beginning on the Derby undercard, guiding Trikari (Oscar Performance) to a massive upset of the $600,000 GII American Turf S. A whopping 47-1 while making his first foray into graded competition, the $27,500 OBS October yearling scratched down into the inside stall and immediately secured the box seat, as 24-1 Formidable Man (City of Light) came across from the four...