Get your daily update of Olympic news: Trivia, trends, and talking points. Lee Chong Wei re-lives day of retirement, Shakur Stevenson on returning to the ring, and find out which judoka is known as "Baby".
Graf was born on 14 June 1969, and was still only 19 when she won the Olympic tournament to go alongside triumphs earlier that year at the Australian Open, French Open, Wimbledon, and US Open.
A year on, the Malaysian – who spent 199 weeks at world number one between 2008 and 2012, and won 705 matches in his career – shared his memories of that day from a first-person perspective on his social media.
"[My] phone kept vibrating. My teammates. My relatives. My close friends. Word spread. They knew. I declined all their calls, trying to remain steady.
"I simply didn’t want to cry in public. Not in front of millions of live Malaysian and international audience.
"I started off my speech. It was unimpressive. Facing the crowd, I didn’t remember the script at all, only relying on the key points to carry me through. Grammar out. Bahasa (Malay language) out. But I thought still okay. As long I didn’t crumble. Inside, I was trembling, shattering... Then, started to thank my coaches, my team.
"I couldn’t hold back. I teared. It has been a year. A year since I announced an end to my 25 years active badminton career span. It would never be the same for me again, but I think I still made the right decision."
The events, put on by the Top Rank promotion company, are taking place within a bio-secure so-called "bubble", where some 150 athletes, personnel, judges, and media were tested twice weekly and kept in an environment sequestered from the outside.
Stevenson, who was accompanied by only his grandfather Wali Moses who is also his coach, wasn't able to see any of his friends or family (aside from Moses) until he left the "bubble".
"I’m hoping that I can get some fans from outside of boxing to become Shakur Stevenson fans," he told the New York Times.
Stevenson won his fight to improve his professional record to 14–0.
Silva revealed to the IJF: "I'm from the countryside and when I arrived in São Paulo I went to live in a dormitory. We were 50 boys living together and we all have each other nicknames.
"I believe it comes from the Dinosaurs (TV show), do you remember it? 'Not the Momma!'"
The 33-year-old also says he is an avid gamer: "I'm a bit of a geek, with online games, board games and things like that."
It is of course archery. In modern pentathlon, athletes must swim a 200m freestyle, take part in an épée fencing tournament, ride an assigned horse around a jumping course, and take part in a laser run which incorporates laser pistol shooting and cross-country running.
Here's today's brain teaser.
In what year were women first allowed to compete at the Olympic Games?
We'll have the answer for you tomorrow.