Nick Kyrgios did not play in the Davis Cup quarter-final rubber against Canada due to his collarbone injury (which has been bothering from Laver Cup 2019).
On the topic of unifying Davis and ATP Cup, Novak Djokovic (who is presently leading the ATP Player Council) will have a word with his other colleagues.
Roger Federer and Mirka Federer have been married to each other for the last 10 years but the Swiss still remembers the pair's first kiss 20 years ago.