Ace Impact justified his Prix de l’Arc de Triomphe favoritism at Longchamp Oct. 1 when a sharp turn of foot helped him win one of the world’s greatest races. Longchamp coverage courtesy of Racing Post Now unbeaten in six starts, Ace Impact runs in the colors of Gousserie Racing and Ecuries Serge Stempniak and showed just why he has headed the betting for the Arc for much of 2023 when he ran down Westover for a 1 ¾-length victory.