South Africa's Andrew Birkett and Serbia's Kristina Bedek have both enjoyed victories at the International Canoe Federation (ICF) Marathon World Cup in Shaoxing in China.
Both paddlers triumphed in short course events in the venue due to be used for the 2019 World Championships.
Races were held over three laps and two portages over a total distance of 3.6 kilometres.
Birkett, the silver medallist at last month's World Championships in Pietermaritzburg, won the men's K1 race in 13min 58.10sec.
He triumphed by just a single second after holding off the challenge of Frenchman Quentin Urban, who was second in 13:59.10.
Adrian Boros of Hungary was third in 14:00.10.
All the top 10 paddlers finished with one minute of the winner.
Bedek won the corresponding women's race by a slightly more comfortable margin as she crossed in 15:24.60.
Anna Koziskova of Czech Republic took second place in 15:27.10, as Lize Broekx of Belgium finished 0.40 further back in third.
World bronze medallist Jennifer Egan finished fifth, over 40 seconds behind Bedek, while Great Britain’s Lizzie Broughton had enjoyed a strong start before suffering a damaged rudder and falling back through the field to finish 12th.
Mateusz Zuchora of Poland took the men's C1 category win in 15:43.50.
Czech Republic took second place again, courtesy of Jakub Brezina, who was second in 15:57.0, and Balazs Dori from Hungary, who was third in 16:03.30.
Long distance races are still to take place.