Australian freestyler Ariarne Titmus has become an Olympic gold medalist, defeating her biggest competition – American Katie Ledecky – in the 400m swim.

Father Steve Titmus told Jim Wilson Ariarne was unwavering in sticking to her race plan – to tail Ledecky and overtake her in the final stretch.

“It is surreal … to say that your daughter is an Olympic champion.

“I’m trying to come to grips with it all!”

Press PLAY below to hear the proud Titmus family’s reactions

Image: Tom Pennington/Getty Images