If you are looking for something beyond just tennis I recommend the Manila Polo Club. Monthly fees are ridiculously low by US standards, especially for a full-blown very upscale club. They have literally every sports recreational activity you can get in RP. For racquet sports, indoor and outdoor courts plus squash and badminton (much tougher sport than most imagine when not played in a back yard with beer in hand). Court fees are stupid low -- around 100P an hour with a ball-boy, half of that picking up your own balls. I could never get used to the ball-boy thing.
One of the best features is the fact that they have relationships with many other clubs in Asia and the USA, so you can have tennis privileges in lots of very nice facilities in varied places.
I am not a club-type guy but if I was in Manila (I much prefer the provinces) I would seriously consider an all encompassing place like this as a complete recreation/entertainment center.