A red card (or red flag) given in an open water swimming competition is a red-colored penalty card (or flag) that indicates the immediate disqualification (DQ) of an athlete due to unsportsmanlike conduct or a serious infraction of the rules during an open water race.

If an open water swimmer has been called for one yellow card (or yellow flag) during the race and commits another infraction worthy of a yellow card, he is automatically given a red card instead. That is, two yellow cards equal one red card.

Upon receiving a red card, the swimmer must immediately get out of the water and swim off the race course.

Photo shows a race official on a JetSki at the 15 km FINA Open Water Swimming Grand Prix race in Isla Cozumel pointing a red flag to a swimmer.

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