Even Federer's practice sessions at the O2 were standing room only affairs and an electric atmosphere greeted him as he walked out into the cavernous arena alongside Nadal just after 10pm local time for what would be his last dance.
"I've done this thousands of times, but this one feels different. Thank you to everybody who's coming tonight," Federer has posted on Twitter earlier in the day.
It certainly felt that way too for everyone present in a crowd which included Australian great Laver -- the man who inspired Federer to create the novel team event.
After the coin toss formalities loud roars accompanied Federer and Nadal, otherwise knows as 'Fedal', as they warmed up to the sound of The Clash's London Calling booming around the venue -- Federer raising his arm in salute after his introduction.