Guaranteed sailing medal thrills GB duo

British women's 470 crew Hannah Mills and Saskia Clark describe their guaranteed Olympic medal as "unbelievable" after the pair secure at least a silver going into Friday's final race in Weymouth.

The crew finished eighth and second in their last two opening-series races to go into a tie for the lead with New Zealand, and, barring disqualification, cannot be caught for the top two slots.

Watch a full replay of the second race here.

Availble to UK users only.

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