Federer has spoken throughout his career about his influential former coach, who died in a car accident aged 37 in 2002 while honeymooning in South Africa.
But as Federer himself put it, he has rarely if ever "broke down" in an interview the way he did when talking to CNN's Christina Macfarlane from his training base in Dubai last month.
Federer turned 37 last August 8, a day before what would have been Carter's 53rd birthday.
When asked what Carter would think about his record men's haul of 20 grand slams, Federer teared up.
