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."
26 de septiembre 2017
|Lacazette not just a goalscorer – Wenger|
|Jerry Jones, entire Cowboys team kneel before national anthem|
|Aguero only world-class Premier League striker – Henry|
|Steelers´ Villanueva ´embarrassed´ he stood alone for national anthem|
|Kane: I use Ronaldo and Messi as motivation|
|LeBron on protests: My voice is more important than my knee|
|Sproles sidelined with torn ACL, broken arm|
|Rodriguez penalty call correct for Wenger|
|Roethlisberger regrets Steelers´ decision to miss national anthem|
25 de septiembre 2017
|Pulis rounds on ´cheating´ Sanchez amid Rodriguez penalty row|
|Ramsey: Arsenal must make Emirates a fortress|
|Arsenal 2 West Brom 0: Lacazette double enough for Gunners as Barry breaks Premier League record|
|Yankees´ Aaron Judge breaks Mark McGwire’s rookie HR record|
|Dunbar a doubt for Scotland internationals after surgery|
|Benjamin MRI reveals no structural damage to knee|
|No Real Madrid doubts over Cristiano Ronaldo, insists Carvajal|
|England Ashes hopeful Westley escapes with bruised thumb|
|Nineteen years and counting – Barry´s record-breaking Premier League career in Opta numbers|
|Barry to break Giggs´ Premier League appearance record|
|US Open finalists Stephens and Keys suffer first-round Wuhan defeats|
|Zidane has faith in Real Madrid style|
|Suso pens AC Milan extension until 2022|
|Cavaliers hopeful of January return for Thomas|
|Real Madrid injuries will make no difference, says Bosz|
|A waste of time - Klopp baffled by media questions ahead of Champions League tie|
|Knicks make Anthony trade to Thunder official|
|Football Association backs Glenn over Sampson sacking|
|Juventus to appeal against fine, Agnelli ban issued by FIGC|
|Aguero and Jesus partnership delights Guardiola|
|Athletics´ Maxwell will continue kneeling despite threats & racial slurs|
|Deulofeu, Semedo return for Barcelona but Alcacer dropped for Sporting CP clash|
|Tom Brady disagrees with Donald Trump´s anthem comments|
|Guardiola uneasy over lofty Manchester City comparisons|
|Josh Norman: Donald Trump is not my president|
|FIFA ´applying common sense´ with expected poppy ban U-turn|
|Walker: It was a nightmare facing Aguero|
|Victorious Darcis sets up Zverev clash in Shenzhen|
|Promes a doubt for Spartak´s Liverpool clash|
|Dortmund meet Madrid again as Besiktas look to end drought - Champions League in Opta numbers|
|Castleford Tigers get six in Super League Dream Team|
|Villarreal promote coach Calleja to first-team duties|
|Ashes hopeful Westley faces anxious wait over hand injury|
|Donald Trump ´so proud of NASCAR´ for stance on protests during anthem|
|Zvonareva ousts fourth seed Begu in Tashkent opener|
|Napoli striker Milik set for long lay-off after knee surgery|
|Mourinho avoids FA punishment after being sent off at Southampton|
|Draxler predicts a ´spectacle´ when PSG face Bayern|
|Tevez challenged to prove his worth by Shanghai Shenhua|
|Mercedes avoiding complacency after Singapore ´surprise´|
|Bielsa has backing of Lille owner despite poor run|
|Shakhtar will attack Man City, predicts Fernandinho|
|Burki hopes Dortmund crowd can be key against Madrid|
|Zverev: Everyone would want Federer as a coach|
|Kroos returns for Madrid´s trip to Dortmund|
|Chelsea boss Conte: For sure, I will return to Italy|
|Neymar and Mbappe need time to settle at PSG, says Ancelotti|
|Aston Martin named Red Bull´s title sponsor from 2018|
|Walker´s World Cup hopes ended by ankle surgery|
|Villarreal sack Escriba after Getafe humbling|
|Mathieu hits out at Barcelona treatment|
|Lukaku and Raiola repeat calls for offensive chant to stop|
|Billy Vunipola would take pay cut to avoid burn out|
|Agar out of India tour with broken finger|
|De Bruyne keen on new Manchester City deal|
|Marcelino laughs off injury after hurting hamstring celebrating|
|Diamondbacks clinch home-field advantage in wildcard game with walk-off win|
|Brady, Rodgers inspire comebacks for Pats and Packers|
|Milan shouldn´t be losing to weaker teams – Fassone slams Montella´s men|
|MLS Review: Sporting KC, Portland keep pressure on|
|Bautista receives emotional farewell from Blue Jays fans|