Well, honey, it's called "tennis," not "long tennis." It's a game where you hit a ball back and forth over a net with a racket. If you're talking about a long game of tennis, well, that's just tennis played for a long time. Not much rocket science there, darling.
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Oh, dude, "long tennis" sounds like a game played by really patient people who don't mind waiting a while between serves. But hey, if you mean "tennis," it's a sport where you hit a ball back and forth over a net with a racket. So, like, unless there's a new version of tennis I haven't heard of, it's just regular old tennis, man.
You probably mean "Lawn" tennis. Lawn tennis is simply tennis played on a grass court.