I'm not talking a fortnight at Wimbledon, or the 2 weeks at the U.S., Australian, or French Open. But 1 day that you spent at a event. Hopefully, no more then 5 or 6 matches that you saw that particular day/night.
For me, it was The 1975 Virginia Slims of Philadelphia Finals on a Sunday in March. Sorry that I don't remember the exact date.
To the best of my knowledge, they didn't even have a playoff for third place, not a 1 set, or even the pro-set. If they did, it would have been between Billie Jean King vs.Martina Navratilova.
But the Singles and Doubles Finals were enough for me.
Virginia Wade (my second favorite female tennis player of all time) won in straight sets defeating Chris Evert: 7-5 6-4. Chris came back from 5-1 down to reach 5-5, before Wade took the first set 7-5, the second set was quite even, yet it was a Victory for Virginia when a Evert forehand went over the line.
Virginia was on a hot streak that week, as she beat Goolagong, King, and Evert in sucession, and dropped only 1 set in doing so. The previous tourament in Dallas, Virginia won that title over Navratilova (who had to retire in the third set), but she also beat Olga Morozova and Francoise Durr in earlier rounds
As for the Doubles Final, the team of long time doubles partners Bille Jean King & Rosie Casals were to play (I believe) a newly formed team consisting of Evonne Goolagong (my favorite female tennis player of all time) and Betty Stove. The Goolagong/Stove team triumphed in 3 sets: 4-6 6-4 7-6 (5-3)