What is the most important tennis match ever played?

One of these was an exhibition, one ran eleven hours, one ended a five-year reign. Importance and quality turn out to be different questions.

1. 1
   King vs Riggs, 1973

   The Battle of the Sexes at the Houston Astrodome, watched by 30,492 in the arena and about 50 million on US television.
   1000pts
2. 2
   Borg vs McEnroe, 1980

   The Wimbledon final whose fourth-set tie-break ran to 18-16 before Borg won in five.
   778pts
3. 3
   Isner vs Mahut, 2010

   Eleven hours and five minutes across three days at Wimbledon, the fifth set finishing 70-68.
   728pts
4. 4
   Laver's 1969 Grand Slam

   The US Open final that completed Rod Laver's second calendar Grand Slam, the last by any man.
   673pts
5. 5
   Djokovic vs Nadal, 2012

   The Australian Open final that lasted five hours and 53 minutes, the longest major final ever played.
   467pts
6. 6
   Evert vs Navratilova, 1985

   The French Open final that took their rivalry to 30-30 and settled little.
   466pts
7. 7
   Federer vs Nadal, 2008

   The Wimbledon final that finished in near darkness at 9-7 in the fifth, ending Federer's five-year run on the lawn.
   466pts
8. 8
   Graf vs Seles, 1992

   The French Open final between the two women who split the early nineties, a year before Seles was stabbed.
   290pts
9. 9
   Gonzales vs Pasarell, 1969

   A 112-game first-round Wimbledon marathon that helped make the case for the tie-break.
   179pts
10. 10
    Ashe vs Connors, 1975

    Arthur Ashe's tactical dismantling of the world No. 1 in the Wimbledon final, the only one he won.
    179pts
11. 11
    Court vs Riggs, 1973

    The Mother's Day Massacre, where Bobby Riggs beat Margaret Court 6-2, 6-1 four months before meeting King.
    179pts