Why would you need to cut out that photo, other than because you can and it proves what a wonderful designer you are.
You don't. That wasn't the point.
The point was simply offering a challenge to someone who said he could cut out ANYTHING in 20 minutes. I say there is no photo of Sharapova with her hair flying that can be done that quickly. No matter how meticulous you are, stringy hair is a nightmare. The blur tool can cover up some of the inevitable jaggedness, but it's still a time-consuming burden.
And in any tennis cutout, you have to decide three things:
1. Use photo with racket in front of a player's body or with only the frame showing (easy).
2. Use photo of racket estended outside of a player's body but forget trying to cut out inside the frame (easy, but it's a pretty obvious cheat).
3. Use a photo of racket outside of a player's body but try to cut out around the strings (good luck; I did this once, will never do it again). It ain't brain surgery . . . it takes longer.