Top favorite Kiran Badloe has been disqualified from race fifth in the RS:X class at the Olympics.
According to the jury, the Dutch windsurfer, who finished second in the race, gave too little space to his Italian competitor Mattia Camboni at the top mark.
The jury only came into action when Camboni filed a protest against the Dutchman's maneuver.
The Italian finished third in the race, just behind Badloe.
The disqualification is a loss for Badloe, who is chasing his first Olympic title in his career around the island of Enoshima.
De Flevolander can remove the disqualification, because in the RS:X class the worst result is not included in the final score.
There are still six races and a medal race on the program.
Due to the disqualification, Badloe loses the lead in the standings to his rival Camboni.
The Dutchman drops from first to third place in the standings and now has twenty penalty points, four more than Camboni.
On Wednesday, the windsurfers will continue the RS:X class with three races. The medal race is scheduled for Saturday. Dorian van Rijsselberghe became Olympic champion in Rio de Janeiro five years ago, but cannot extend his title in Tokyo because the Netherlands can only send one windsurfer in the RS:X class. Badloe won the competition with Van Rijsselberghe.