Nick Bollettieri, legendary tennis coach, dies at 91

• His teachings helped produce 10 No. 1-rated players, per the Bradenton Herald.

What they're saying: "(W)hat he turns out on the court are little troopers, once-dear children transformed into steely-eyed tennis fanatics who scowl across the net. This is called producing champions," Sports Illustrated's Barry McDermott wrote in 1980.

Flashback: Bollettieri's controversial methods included denying his students the simplest pleasures, like television on weekdays, or water.

• He grew angry if kids twirled their tennis racquets or if they took too long picking up practice balls, some of which was addressed in the 2017 Showtime Films documentary "Love Means Zero." Sprints on the beach was common punishment.

Bollettieri sold the academy to IMG in 1987, but he continued to train young players there and worked with Arthur Ashe to bring tennis to kids in urban communities.