I don't get it.
How can you people, very knowledgeable about calories and rate, lump all tennis play the same?
Don't some of you play 30 shot points? Running back and forth, lunging, and trying real hard? Is that the same caloric burn of one serve and a miss?
I've played sets and matches that barely get my heartrate up at all.
I've played half a game that had me dragging and crying "UNCLE" from my exertion and cardio overload.
There is a difference!