For a long time, I though that Roger was either an ESFJ or an ESFP, but after watching a zillion videos of these types, despite much of the descriptions fitting Roger, and the fact that his propensity for having a long-term plan for his career is more likely to constitute J, they just seem too outwardly extroverted as types to really fit Roger.
If I had to guess, I would suggest that Roger is an ISFP
, but I really don't know. What I do know is that it's almost impossible that he is an NT. I'm still not settled on this view, but it's amazing how much Roger reminds me of the couple of ISFPs I have known well in my lifetime, but the realisation of this only occurred recently.
For other tennis pros, well it's difficult but here are some guesses.
Djokovic - ESTJ
Murray - ISTP
Sampras - ISTP
Nadal - no idea, but the one I have considered the most is ISTJ
Agassi - not sure, maybe ESFP