In Race 5 earlier Saturday, Team New Zealand benefited from two penalties and another mistake by Team U.S.A. and won by 2 minutes 4 seconds, the biggest margin in the series.
Helmsman Peter Burling ensured there would be no signs of relenting after Team New Zealand moved to the cusp of securing the America's Cup on Monday (NZT).
But Spithill's been here before.
This is a rematch of the epic 2013 match on San Francisco Bay.
We have an incredibly talented group of guys and were excited to get back out there and race again tomorrow, he said.
"I'll do whatever is good for the team".
New Zealand then displayed masterful control of their innovative cycle-powered boat, foiling all the way around the course en route to a 30-second win.
"Looking back we needed to take more time to make key decisions in our strategy".
In the second race, Burling out-foxed Spithill in the pre-start box to hit the startline a mammoth 14 seconds in front.
When we entered this we knew we were in for one hell of a battle. "We've been there before".
But things could change if New Zealand triumph as the winners decide the format of the next cup and the Kiwis are the only team not to have signed up to the deal. "We got asked some questions yesterday and I feel we answered them with our performance on the water". That's the way we want sailing to be.
Spithill said Oracle made too many changes to the boat to mention. The Kiwis have had their share of mayhem this spring, including a capsize in the challenger semifinals.
"That's why today was very, very important".
Burling has won Olympic gold and silver medals, along with Team New Zealand crewman Blair Tuke.
To which Spithill responded, "It's just beginning, mate". But they faced up to the challenge and sped away to the finish for the first win of the series.
The defending champions trailed 3-0 after two days of competition and New Zealand strengthened their grip on the 35th edition of the famous race by winning Race Five in Bermuda on Saturday.
But Oracle closed the distance and the boats were even as they went through the gate mark five. The Kiwis had a bad maneuver and Spithill sailed into the lead and on to victory.
New Zealanders, in their uniform of black shirts and red socks, feted the victors with flags and cheers as Burling, Ashby and the team lifted the ornate silver trophy, which they later paraded triumphantly back to their base. Spithill dipped underneath and both crews pushed the protest button. At the first cross on the upwind, Spithill had extended enough to cross ahead of the Kiwi boat.
Defending champions the US took their first win in race six on Saturday but were again easily distanced on Sunday.
Team New Zealand's dominance so far saw Team USA's Australian skipper Jimmy Spithill offer to stand down.
New Zealand snatched back the momentum after the United States of America notched their first win of the series on Saturday.