The U.S. yacht won the first and second races by margins of more than a minute when the Australian yacht suffered equipment failure, but the
Australia II took the third race, and came back to win the fifth and sixth races after
Liberty won the fourth. This was the first time the America's Cup had needed a sixth race, let alone a seventh. The cup title came down to the seventh and final race. For the seventh and deciding race on 26 September 1983 the wind was light at around eight knots. The pre-start was not a typical match race start. "Neither party wanted to make a mistake and end up in the protest room," Conner would explain later.
Liberty won the start by eight seconds ahead of
Australia II on paper but the Australians held a controlling position at the favoured end sailing toward the favoured side which gave them the early lead.
Australia II was subsequently overtaken by Conner who built up what seemed to be an unassailable margin. At the start of the penultimate leg (a square run) the America's Cup looked like it would stay in Newport. However, Conner knew Australia II was not beaten. He and his tactician checked Australia II's relative speed and realised that Australia II would overtake Liberty before the leeward mark, despite Liberty's lead. Liberty had been reconfigured for light air performance, sacrificing downwind speed. This leg was the only square run of the race (Fremantle had two) so the issue had not yet been a factor in the race. Conner opted not to "cover"
Australia II (it is not possible to "cover" when running downwind because the astern vessel blankets the lead boat's breeze) and instead kept well clear of Australia II's wind-shadow and went searching for favourable wind shifts. He was unsuccessful in this and
Australia II overtook Liberty by the leeward mark. Conner then engaged
Australia II in a spectacular tacking duel with nearly 50 tacks including a number of faked "dummy" tacks trying to break the Australians' cover.
Australia II held on until both boats reached the starboard layline in amongst the spectator fleet and tacked several boat lengths ahead of
Liberty and sailed to the finish to take the race.
Australia II crossed the finish line with a winning margin of 41 seconds, becoming the first successful challenger in the 132 years "since the schooner
America won it in a race around England's
Isle of Wight in 1851". ==Aftermath==