John McEnroe is known as much for his on-court outbursts as his classic rivalries with Bjorn Borg and Jimmy Connors. Here the American tennis legend answers quickfire questions from CNN's Open Court. Himself in three words? "Interested person overall." steve powell/getty images/file
"Wimbledon final in 1981 when I finally beat Bjorg." McEnroe defeated the Swede 4-6 7-6 7-6 6-4 to win at the home of tennis for the first of three times, his personal career highlight. tony duffy/getty images/file
"I hear that about 10 times a day." McEnroe was notorious for arguing with umpires -- here haranguing an official during a semifinal win over Connors at Wimbledon. His famous catchphrase: "You cannot be serious!" Central Press/Getty Images/file
"American Pie." McEnroe is a keen musician, and is seen here performing with legendary guitarist Bo Diddley during the U.S. Open in 2005. As well as Don McLean's 1970s classic, he's also a big fan of the Black Keys and Foo Fighters. DON EMMERT/AFP/Getty Images/file
"French Open 1984, just the last few games." McEnroe's biggest tournament regret is blowing a two-set lead against Ivan Lendl and losing 3-6 2-6 6-4 7-5 7-5 in his only final at Roland Garros. Steve Powell/Getty Images/file
"Derek Jeter (right) and Tom Brady," McEnroe says of his most admired current sports stars. "I think they're incredible team players. I'm an individual but for me to see how they make everyone around them better ... you don't hear anything about them off the field, it's impressive." Getty Images/file
"My toughest opponent was a guy by the name of Pete Sampras." McEnroe's career briefly overlapped with that of the 14-time grand slam champion, but he lost all three of their matches. McEnroe was later his Davis Cup captain and they have renewed their rivalry on the legends circuit. Donald Miralle/getty images/file
"Sean Penn. He played high school tennis and we seem to be cut from the same cloth." The actor, far left, is pictured with McEnroe, the tennis star's wife Patty Smyth (2nd left) and Donna Karan at a Haiti relief fundraiser in 2011. Dimitrios Kambouris/Getty Images for The Ben Stiller Foundation/file
"My hero was Rod Laver." The Australian twice completed the grand slam of winning Wimbledon and the French, Australian and U.S. Opens in the same year -- the only player, male or female, to do so. AFP/Getty Images/file
"Its energy -- New York is an inspiring metropolis that continues to amaze me ... it's the greatest city in the world." Joe Corrigan/Getty Images/file