Australians Noemie Fox and Rosalyn Lawrence squared off in the C1 final, with Fox's time of 79.82secs nearly 3secs clear of her compatriot.
In the men's C1, German Anton Franz came through for the win, heading Frenchman Cedric Joly by 0.35secs, after Rio silver medalist Matej Benus (Slovakia) touched a gate and incurred a 2sec penalty in the semifinal. That allowed another Frenchman, Edern Le Ruyet, to come through for third.
Czech Republic star Via Prindis triumphed in the men's K1 final, meanwhile, heading Stefan Hengst (Germany) by 2.97secs, after Hengst picked up two touches.
Tomorrow's format will see more traditional 18-gate course, with two runs of qualifying for Saturday.
The top-10 from the first qualifying run will contest for another cash shootout tomorrow night, with 30 more paddlers from the next run joining them in Saturday's semifinals.
Results:
Women:
C1: Noemie Fox (Australia) 1, Rosalyn Lawrence (Australia) 2, Luuka Jones (New Zealand) 3.
K1: Lizzie Leave (Great Britain) 1, Luuka Jones (New Zealand) 2, Martina Wegman (Netherlands) 3.
Men:
C1: Anton Franz (Germany) 1, Cedric Joly (France) 2, Edern Le Ruyet (France) 3.
K1: Bit Prindis (Czech Republic) 1, Stefan Hengst (Germany) 2, Mike Dawson (New Zealand) 3.