Jim Courier, who first rose to No. 1 in the ATP Rankings on February 1992, talks about what it took to be the best and analyses Daniil Medvedev and Alexander Zverev's 2021 form and chances at rivalling Novak Djokovic in 2022. SUBSCRIBE: bit.ly/2dj6EhW WEBSITE: atptour.com FACEBOOK: facebook.com/ATPTour TWITTER: twitter.com/ATPTour INSTAGRAM: instagram.com/atptour About the Official ATP Tour YouTube Channel: As the global governing body of men’s professional tennis, the ATP’s mission is to serve tennis. We entertain a billion global fans, showcase the world’s greatest players at the most prestigious tournaments, and inspire the next generation.