Rafa, the four-part Netflix series directed by Zach Heinzerling, chronicles Rafael Nadal’s difficult decision to retire from tennis at the end of the 2024 season, after an astounding 22 Grand Slam wins — and also several injuries and a painful foot condition that plagued him throughout his career. The doc weaves together archival footage of Nadal’s intense training sessions with his coach, Uncle Toni; interviews with rivals Roger Federer, Novak Djokovic and more; and glimpses of his home life to show what has motivated the former No. 1 pro to compete for more than two decades, as well as the mental and physical toll it has taken. “I…