Denis Lynch and Bertram Allen recorded wins for Ireland at the at the big five-star World Cup show in Bordeaux in France on Friday.
Lynch collected €20,300 for his victory in the feature speed class, the Prix Generali, riding 15-year-old bay gelding Abbervail van het Dingeshof.
Seventh-last to jump from a starting field of 38, Lynch finished in a scorching time of 55.73 seconds, and despite the best efforts of the next six competitors - which included five of the world's top 20-ranked riders - Tipperary-born Lynch proved uncatchable and came home with half a second to spare.
Second place went to Germany's world number three Daniel Deusser aboard the 11 year-old mare Espyrante.
Wexford rider Bertram Allen won the opening international speed class, while Cork's Billy Twomey claimed third.
Maintaining a remarkable run of form that has taken him to a current career high of number 13 in the world rankings, Allen piloted the 12 year-old mare Wild Thing L into first place at the French show with almost three seconds in hand over Belgian challenger Constant Van Paesschen and Diamanthina van't Ruytershof.