In an interview with TMZ Sports, along with wife Steffi Graff, Agassi summed up their feelings for Robin Williams.
"Stefanie and I are saddened at the loss of our friend. He was one of the kindest, most generous people we have ever known."
Agassi's charity auctions often included items from Williams, even when he couldn't attend the events.
In 2009, Tennis.com asked Williams about a "Night at the Net" charity event where he faced a serve from Pete Sampras,
"...when he brought it, it was like a particle. You realize, “OK, I’m ready!” and all of a sudden it was gone."
Robin Williams had observations on some other players such as Roger Federer who he called, "The Terminator" and when asked if he liked Maria Sharpova, Williams said,
"Wonderful to watch. It’s weird when you watch women’s tennis now with all the grunting and shouting. It’s a bit like phone sex. So you have to be very careful not to get too excited."
Williams took up tennis from his mother Laurie who was a devout player in the San Francisco area. When asked what he liked about the sport, Williams noted, "The mental game combined with the physical – I love both."
RIP Robin Williams