Slingsby is guaranteed silver, while Cypriot rival Pavlos Kontides is certain of winning his country's first ever medal in Olympic history.
Reigning gold medallist Paul Goodison's chances of a podium finish at London 2012 came to an end today.
The 34-year-old Great Britain sailor came into the regatta amongst the favourites but has struggled all week due to a back injury picked up in the second race.
He secured a ninth and then eighth today to leave him sixth overall, meaning he will compete in Monday's medal race but without a chance of a medal due to the points margin.
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