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."
|Germany v Cameroon: Logistical motivation for Low|
|Federer ends Mayer´s title defence in Halle|
|Alonso´s season continues to go downhill as car rolls away|
|Chelsea to Aston Villa will not feel like a step down for Terry, claims Sherwood|
|Pellegrino appointed Southampton manager|
|Paul George gave Pacers a ´gut punch´ with news of desired departure|
|Confederations Cup Diary: Mexico win MediaBowl, Beasejour is our new best friend and everyone loves|
|Salah signing takes Liverpool a step closer to title - Berger|
|Bumrah unimpressed as traffic police mock no-ball woe|
|F1 Raceweek: Mercedes and Ferrari vie for momentum in Baku|
|Frank de Boer will fulfil ´every manager´s dream´ at Crystal Palace, says brother Ronald|
|Kaymer likens Woods´ impact to Muhammad Ali|
|Bale determined to win ´more trophies´ as Madrid exit rumours persist|
|Osorio: Russia clash the perfect chance to answer critics|
|Josh Harrop explains Manchester United exit|
|Carrick not thinking about Cristiano Ronaldo reunion at Man Utd|
|Santos defends Portugal´s Euro 2016 win|
|Vinales puts down a marker as Lorenzo endures dismal day|
|Man Utd youngster Harrop signs for Preston|
|New Zealand v British and Irish Lions: Everything you need to know|
|Ferguson was stunned when Van Gaal sold Evans, claims O´Neill|
|Santos keeps New Zealand guessing on Ronaldo|
|PSG´s project is not lost – Marquinhos urges Verratti to stay amid Barcelona interest|
|Don´t compare me to Mourinho, says New Zealand boss Hudson|
|Leeds complete signing of Poland midfielder Mateusz Klich|
|Hudson claims New Zealand are not scared of Ronaldo and Portugal|
|Luke injured in Warriors win, Hayne torments Tigers|
|Sevilla refute Juve interest in N´Zonzi|
|River Plate duo Mayada and Martinez Quarta fail drugs test|
|Cristiano Ronaldo mocks Real Madrid team-mate James Rodriguez´s ´ugly´ new haircut|
|Gatland questions All Blacks´ bench, Savea absence|
|All Blacks expect to tame Lions, says Read|
|Chelsea, Arsenal to dedicate Community Shield to Grenfell Tower victims|
|Dani Alves drops massive Man City transfer hint|
|Forsberg wants to take next step - agent hits out at ´arrogant´ RB Leipzig|
|Sevilla told €9m not enough to re-sign Inter midfielder Banega|
|ACA rejects improved Cricket Australia offer|
|Klopp must have plan B to fulfil Liverpool´s Premier League ambitions - Garcia|
|Chelsea should forget Bakayoko and give Chalobah a chance - Wilkins|
|Double for Evans as Wales beat Samoa|
|Messi´s prison sentence swapped for fine|
|Neymar would welcome Lucas Lima at Barcelona with ´open arms´|
|Manchester United is a ´tempting invitation´ for Monaco star Fabinho|
|Spalletti cools talk of Valero, Szczesny to Inter|
|Fifita signs long-term Sharks deal|
|Barcelona star Neymar splits with girlfriend Bruna Marquezine|
|Howley disappointed by Spencer incident on Lions tour|
|Luis Garcia: Salah has everything to succeed at Liverpool|
|Astros first to 50 wins after sweep of A´s|
|Cricket Australia offers players improved deal|
|Coyotes split with coach Tippett, citing ´philosophical differences´|
|NBA Draft 2017 full results: 76ers select Fultz with number one pick|
|Timberwolves acquire Butler from Bulls in blockbuster trade|
|Thurston to undergo surgery, miss rest of 2017|
|Bracewell misses out as New Zealand trio earn contracts|
|Cambiasso: I didn´t fit in at Madrid because I wasn´t a galactico|
|Benzema eyeing more titles with Madrid|
|Mignolet ´really hungry´ for silverware with Liverpool|
|Spieth opens with 63 to lead Travelers|
|Ball stays in LA, goes to Lakers with number two pick|
|Philadelphia 76ers select Fultz with number one overall pick|
|Salah: Everything has improved since I left Chelsea|
|Low lauds ´excellent´ Stindl after Germany draw|
|Rangers swoop for Mexico duo Pena and Herrera|
|Confederations Cup Social Diary: Record man Sanchez shines as rivals fail to bury hatchet|
|Sanchez refuses to offer Arsenal future update|
|Confederations Cup Diary: Summer ´snow´ and Ronaldo mural explained|
|Widnes climb off the bottom with Leigh victory|
|Alexis Sanchez´s record-breaking goal ´very special´, says Pizzi|
|Chiefs part ways with Dorsey but give Reid an extension|