Jimmy Spithill's USA capsized, while Sir Ben Ainslie's Great Britain claimed honours on the final day of the SailGP opening round in Bermuda.
In the day's first race - and fourth of the overall regatta - Spithill's USA and fellow Australian Nathan Outteridge's Japan collided, leaving both boats unable to finish and the Americans capsized.
The failure to finish means Spithill's USA sit last on the SailGP leaderboard, after its opening regatta.
That chaotic first race was won by Great Britain, who advanced to the final against Australia and France.
After winning four of the five fleet races, Tom Slingsby's Australia couldn't continue their dominance, as Ainslie completed a smash-and-grab to take the victory.
Great Britain sailed the perfect final, finishing four seconds clear of Australia for top spot on the leaderboard after the opening round.
Meanwhile, Peter Burling's New Zealand endured a slightly better day, finishing fourth and fifth, bettering than their opening efforts of two last places and a sixth.
SailGP will now head to Italy for its second regatta on June 5-6.
Leaderboard: 1 Great Britain (10 points), 2 Australia (9), 3 France (8), 4 Spain (7), 5 New Zealand (6), 6 Denmark (5), 7 Japan (4), 8 USA (3).