Stan Wawrinka jokingly called Roger Federer an "a******" during an emotional speech after the Indian Wells final.
Federer claimed a record-equalling fifth title at the event with a 6-4 7-5 victory in the decider on Sunday.
The win saw Federer make it 20 victories from 23 meetings against his friend and fellow Swiss.
Wawrinka, a three-time grand-slam champion, was in tears during the trophy presentation, much to Federer's amusement.
"I would like to congratulate Roger. He's laughing, he's an a******, but it's OK," he said.
"I lost some tough ones against you, but when you played the final in Australia, I was still your biggest fan, so congrats for your comeback and congrats for today.
"Congrats to your team, to your family and everybody who's been around you for many years.
"Anybody who loves tennis loves to watch you so it's always good to see you back at that level and hopefully for many years."
The result saw Federer continue his stunning comeback from a knee injury, adding an ATP 1000 title to his 18th major trophy – secured at the Australian Open – to begin 2017.
Federer, 35, was predictably thrilled with his 90th ATP World Tour title, and hopeful he can continue his form.
"It's been just a fairytale week once again. I'm still on the comeback. I hope my body is going to allow me to keep on playing," he said.
"I was very sad when I couldn't come here last year. Just being here is a beautiful feeling. It's one of my favourite tournaments. I came here for the first time 17 years ago. So to be here again as the champion is an amazing feeling."
|Manchester United job like Real Madrid, says Mourinho|
|Fernandinho is much better than I was, Guardiola claims|
|That Harry Kane team? – I´m over Guardiola dig, says Pochettino|
|Tuilagi and Toomua return to Leicester line-up|
|Mourinho open to January moves as Griezmann rumours swirl|
|Berizzo set for Sevilla return after cancer surgery|
|Malinga left out of Sri Lanka´s T20 squad|
|Manchester City will not go unbeaten in Premier League - Guardiola|
|Man City are the best – Pochettino braced for Spurs´ toughest test|
|Kristaps Porzingis injury update: Knicks big man says knee ´shouldn´t´ be bad|
|Conte hopeful over David Luiz´s ´serious´ knee injury|
|Neymar not an injury risk after Brazil trip - Emery|
|Bailly to miss three months due to ankle surgery|
|Klopp defends Liverpool rotation policy|
|Arsenal fan Prince Harry´s wedding day to clash with FA Cup final|
|He´s one of the best – Simeone showers Oblak with praise|
|Juventus won´t sell in-demand Pjaca, agent claims|
|Bolasie in line for Everton return after long-term injury|
|Bedene to switch back from Britain to Slovenia|
|Maradona told Real Madrid to sign Mbappe|
|Samuels out of NZ tour, Narine to miss T20s|
|Sydney FC 3 Melbourne City 1: Champions come from behind to go eight points clear|
|Red-hot Salah wins Player of the Month|
|Heynckes unaware of reported Sanches loan termination|
|Maradona: I´d have won more Ballons d´Or than Ronaldo and Messi|
|Khawaja pleased to restore parity in Perth|
|Bairstow enjoys playful celebration of crucial century|
|The Ashes Round-up: Smith leading by example again|
|Wenger confirms Wilshere contract talks imminent|
|Sensational Smith leads Australia fightback|
|We´ve never been approached by Man United – Wenger rejects Ozil reports|
|Joshua ´absolutely´ capable of unification, says Klitschko|
|Mathews fit for India-Sri Lanka series decider|
|Lewandowski demands focus ahead of Christmas|
|Fury not rushing back to take on Joshua|
|Klopp right to rotate at Liverpool – Neville|
|Overton strikes twice for England in Perth|
|LeBron´s 59th triple-double leads Cavaliers past Lakers|
|Jets offensive coordinator admits surrender in blowout loss to Broncos|
|Osweiler helps Broncos past Colts|
|England collapse to be all out for 403 in Perth|
|Donnarumma plays down Milan exit rumours|
|Barkley could leave in January – Allardyce|
|Siemian suffers shoulder injury, Osweiler in for Broncos|
|Pulisic voted youngest-ever male USA player of the year|
|Griezmann will be allowed to leave – Simeone|
|Steelers LB Shazier has begun rehabilitation process|
|Guardiola appears to aim another dig at Mourinho|
|Vardy relishing Fleetwood return|
|Pau stay perfect with win over Agen|
|USB joking? Klitschko stick and robe sold for mega money|
|Almiron blocked from becoming Las Palmas coach|
|Ligue 1 adopts VAR from next season|
|Calabria extends AC Milan contract|
|Everton give new deals to Calvert-Lewin, Holgate & Kenny|
|Gooch backs Cook to rediscover England form|
|Itoje could return before Six Nations|
|Under-fire Hughes promises results will come for Stoke|
|Mourinho asked to explain pre-Manchester derby comments|
|Stoger sets Dortmund end of year target|
|Dyche: No swaggering from high-flying Burnley|
|Watzke plays down Nagelsmann rumour as Dortmund plan for 2018|
|Guardiola´s record runs with Manchester City, Bayern Munich and Barcelona compared|
|Martin lashes out at ´double standards´ in Froome ´scandal´|
|Day two crucial for England´s Ashes chances - Gooch|
|Benteke goal drought a concern for Hodgson|
|Nibali to skip 2018 Giro to focus on Tour|
|City look frightening – Rose|
|Kahn regrets rejecting Manchester United|
|Ireland scrum-half Marmion commits to Connacht|