Sporting Life February 16, 1895 Fred Hoey at Monte Carlo
https://digital.la84.org/digital/collection/p17103coll17/id/55105/rec/7

I believe the French Franc conversion to $s pre-1900 was about 4:1 so 4000 F = $1000 which would be about $35,000 now. Not counting side bets!
It went down to 5:1 right before WWI

1896
https://digital.la84.org/digital/collection/p17103coll17/id/55322/rec/13
Tie Clarence Dolan (U.S.) and Demouts (France)

https://digital.la84.org/digital/collection/p17103coll17/id/47165/rec/14