Irish pair had reached the decider
Ryan Seaton and Matt McGovern have finished in ninth place in the Men's 49er Medal Race, which has left them ranked in 10th overall.
The Irish duo finished in a time of 21:29.
They had been sixth after the first two marks of the race but slipped back to 10th by the third, before taking ninth in the race.
New Zealand pair Blair Tuke and Peter Burling won the gold medal.
Silver went to Australia and bronze to Germany.