A tidal wave of discord has hit America's Cup sailing after INEOS Britannia announced it was parting ways with CEO and skipper Ben Ainslie for the 38th edition of the premier yachting race.

Defending champion Jannik Sinner overcame some third-set cramping and beat Ben Shelton 7-6 (2), 6-2, 6-2 on Friday to return to the Australian Open final as he pursues a third Grand Slam title.