They hit the waves alongside the surfers at the Rincon Classic.
Dolphins are common in the area, although it's rare to see them so actively joining in with surfers.
It wasn't just a couple either; there were about a dozen dolphins cruising the waves.
The crowd cheered them on as competitors watched on in awe.
This story was first reported by KGO-TV, KTRK-TV's sister station in San Francisco.
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