OK, people were wondering why she was playing tennis in a bikini... but why was she playing tennis in wedge heels? Does she have Barbie feet or something? You can break an ankle...
A. She's short.
B. Heels shifts the weight-bearing position on the feet, causing the legs to tense and appear more toned--hence why women wear them when they want to look their best. Wedge sandals are a bit of a perverse extrapolation of said theory, but there you go.
C. You have to realize that she's been training for a marathon--literally. If she looks "tighter" and less "fleshy" than usual, it's because she's much more toned and muscular than before. Not that this applies to why she is wearing wedge sandals, but I think my point is made. This is basically Love at her most athletic, and you can see her stomach is toned (mayhap even ripped), her neck, legs and arms are absolutely tight, and Thelma and Louise (her boobs, for those of you in Rio Linda) STILL have awesome projection off her chest, proof their fabulous selves still are hanging around, despite the loss of body fat.
Oh, and did I mention she's short?
All you haters, I would that you pay heed to this smiley:

Q-"
Thank you"-BE