Rio de Janeiro: Ferry Weertman won a ferocious battle for the men’s 10km open water swimming gold at the Rio Olympics yesterday, edging Spiros Gianniotis in a frantic photo finish to cap a Dutch open water double.

Weertman’s triumph by the narrowest of margins —both he and Gianniotis were credited with a time of 1hr 52min 59.8sec — followed teammate Sharon van Rousendaal’s victory in the women’s race off Copacabana beach on Monday.