In what is tipped to be the final edition of the unique tournament, the best was saved for last as Federer became the first player to win three Hopman Cups, teaming with Bencic to make it successive titles in Perth.
And what a point it was, with Alexander Zverev and Angelique Kerber trying relentlessly to pass Federer and Belinda Bencic at the net, but ultimately failing when Zverev went for a backhand too far out of his reach.
The Swiss have now won the Hopman Cup on four occasions, with Germany unable to halt a 24-year wait to lift the trophy.
After the final point of their mixed doubles match, Sakkari was not any more Federer's opponent, but his biggest fan.
Kerber defeated Barty 6-4, 6-4 to give Germany the lead and Zverev followed with a 6-4, 6-3 win over Ebden to set up a rematch of last year's final against Switzerland.
"I'm very happy about these records, but I didn't come here for that", 20-times major champion Federer said.
Under the short sets format, the match is decided by a winner-takes-all point if scores are locked at 4-4 in the third-set tiebreak.
After overpowering a stubborn Ebden, Zverev said he and Kerber were motivated by last year's loss in the final.
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"We came so close - we were one shot away".
The final was similar to the one meet a year earlier: Zverev lost to Federer, but this time not in three sets, but clearly in 4:6, 2:6.
The 21-year-old is equal third favourite alongside Rafael Nadal to win the Australian Open.
But Federer snared the crucial break in the 10th game of the first set, before breaking the young German again early in the second set on the way to the 70-minute win.
Zverev had evened up the head-to-head stats with Fed last year with some decisive victories, especially finishing up the year at the ATP Finals event as the victor.
He was pleased to maintain his unbeaten singles record during the week, during which he never dropped his serve.
Following the men's singles meeting, Kerber took on Bencic in the women's singles match. Bencic sealed a final love break of Kerber with a forehand victor, 4-0. But in the end, the experience and athleticism of Kerber proved just enough to seal the match, 7-6 (6), with a final victor.