https://www.espn.com/tennis/story/_/id/35188046/hall-fame-tennis-coach-nick-bollettieri-dies-91

I did some freelance writing for a tennis site from 2010-2014 and was able to talk to this guy several times as he was friends with the site owner and did videos for him. Opend his academy in 1978 and got it bought by IMG in 1987 which transformed it into the famous IMG Academy.

Coached 10 players who became #1
Agassi
Serena & Venis
Boris Becker
Jim Courier
Monica Seles
Maria Sharapova
Marcelo Rios
Martina Hingis
Jelena Jankovic