Spithill was skipper of Oracle Team USA when they achieved one of sport's most remarkable comebacks - beating Team New Zealand in the America's Cup match after trailing by 7-1.
McCaw, who led the All Blacks to World Cup wins in in 2011 and 2015, retired shortly after lifting the Webb Ellis trophy six years ago - after 148 tests in the black jersey.
Whatever McCaw told Spithill it seemed to have worked: Luna Rossa defeated the American syndicate, helmed by Kiwi Dean Barker, comfortably in both races to take a 2-0 lead in the series.
Heading into the Cup racing?
• Give yourself plenty of time and think about catching a ferry, train or bus to watch the Cup.
• Make sure your AT HOP card is in your pocket. It's the best way to ride.
• Don't forget to scan QR codes with the NZ Covid Tracer app when on public transport and entering the America's Cup Village.
• For more ways to enjoy race day, visit at.govt.nz/americascup.