Marianne Vos has won a cyclocross world cup for the second time this season.
After last week's victory in Waterloo in America, the Brabant Sunday was the strongest in Iowa City.
In the men's race, Lars van der Haar finished second behind the Belgian Eli Iserbyt.
Vos took the lead halfway through the race, together with Betsema and the Hungarian Kata Blanka Vas.
A slip from Vas left the two Dutch women in front.
On the last lap, 34-year-old Vos broke away from her compatriot on a difficult climb and did not give up her lead.
Betsema crossed the finish line in ten seconds and Vas was third at an appropriate distance.
World champion Lucinda Brand, who triumphed in Fayetteville on Wednesday, had to settle for fourth place this time.
In the battle for fifth place, Annemarie Worst was trumped by Puck Pieterse.
Vos booked her first cyclo-cross World Cup victory last week since November 2019.
Van der Haar finishes second among the men
In the men's race, thirty-year-old Van der Haar was part of the leading group in the first rounds.
From there, Iserbyt drove away two laps before the end, after which he made a gap with the competition.
Van der Haar was the only one able to stay in Iserbyt's track, but eventually crossed the finish line eleven seconds after the Belgian.
Michael Vanthourenthout finished third, half a minute behind his compatriot.
Van der Haar was last successful in the Night of Woerden two years ago.
His last World Cup victory dates from January 22, 2017 in Hoogerheide.
Iserbyt also won the first World Cup cross of the triptych in the United States in Waterloo last week.
Mathieu van der Poel, Wout van Aert and Tom Pidcock did not participate in the first three games of the season.Keywords: marianne vos, world cup, victory, eli iserbyt, brabant sunday, season, cross, iowa city, fox, lars van der haar, lucinda brand, america, waterloo, strongest, race