Switzerland have defeated Germany in the final of the Hopman Cup at the Perth Arena to clinch their third title. Federer made the match his own with a massive 6-2 win in the final set and took the match.
Federer, who won all four of his singles matches this week, said he feels strong heading into his title defense at the Australian Open, which begins January 15 at Melbourne Park.
It was Federer's second Hopman Cup triumph after victory in 2001 alongside then world number one Martina Hingis.
"Now I'm back winning the Cup again. I'm healthy, had a great off-season, so pleased to have the year that I had".
"I was able to put Switzerland ahead so I am very happy".
Australia levelled the tie after Thanasi Kokkinakis upset world number four Zverev 5-7 7-6 (4) 6-4, leaving Germany facing a must-win mixed doubles match to progress to the final.
"I'm really feeling good here".
However, the young German managed to prevail in the tie-breaker as he aimed to repeat his singles win over Federer at the Hopman Cup previous year, when all three sets were decided by tie-breakers. It was Kerber's fourth straight singles win at the Hopman Cup this year.
Kokkinakis retained momentum in the first set of the doubles, but Kerber remained composed despite a succession of unforced errors from Zverev - and taking the full brunt of a Kokkinakis forehand on her hip - to steer Germany to a 1-4, 4-1, 4-3 (3) in the Fast 4 format.
"It caps off a great week as a team, but personally for me as a singles player, I played great", Federer said.
"So just being on the court with her, practising with her, seeing how professional she was, was a dream come true".
"I couldn't wish for a better partner".
"Switzerland takes it all, like we've seen so many times in tennis".
The German was the one who lost his cool as the match slipped away, copping a code violation for an audible obscenity after disputing the chair umpire's decision to replay a Zverev serve in the second set.
"It makes us young guys look bad".