Some more singing might have also been on the cards for Federer on Saturday, after Australian Nick Kyrgios was forced to pull out of their quarterfinal at the ATP tournament in Indian Wells, California with illness.
Federer won 6-4, 7-5 and became the oldest player to win a 1000th Masters title in the process.
"I was trying, when he looked at me, not to give him the sad face", Federer said.
"I understand the talk of world number one, especially with Novak and Andy not playing in Miami", he added.
After serve had dominated the first set, Wawrinka blinked first and Federer broke at 5-4 to take the lead. Prior to the Australian Open his aim was to get his ranking to as high as eighth by the time Wimbledon was over. A year ago I didn't win any titles. "That's why again I sort of go to Miami knowing it's going to be really hard". The way he's playing is just so attractive, is just so nice. If the run to his 18th Grand Slam title at the Australian Open was stunning, at Indian Wells Federer produced another captivating sequence of performances.
"It's been just a fairytale week once again".
The 29-year-old said on his Facebook page: "My doctor has strongly advised against play because my elbow injury, that I keep carrying on for months, got worse in the past week".
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"I've lost some tough ones against you, but when you played the final in Australia, I was your biggest fan", a choked up Wawrinka told Federer at the trophy ceremony.
In sublime form these days, Federer books Indian Wells title clash with fellow countryman Wawrinka Roger Federer's resurgence has already out-stripped his expectations, but the Swiss great says relishing the game is more important now than chasing a ranking.
It was not until the 10th game that the first break point came and Federer grasped his chance, winning an epic rally when Wawrinka - who opted not to challenge when he appeared to serve an ace earlier in the game - sent a forehand long.
"Unfortunately I am unable to play today due to sickness", he wrote in a statement posted to his Twitter feed.
'I've beat him only a few times.
"I want to wish Roger the best of luck for the rest of the tournament and thank everyone for their support so far here at the BNP Paribas Open".