Anna and Serena
I love the idea of the two of them teaming up to fight crime. Anna and Serena would be UNSTOPPABLE together. They're both very smart women at the top of their careers, they both have an iron will to succeed and a proven track record of achieving their goals. Serena is highly charismatic and charming, whilst Anna can hypnotize most Americans with her British accent (and the fact that a lot of us are a little scared of A Dubs already), which means their interrogations would be highly fruitful. Also, there was that time that some IDIOT tried to steal Serena's phone and she literally chased him down the street and got it back, so she also has a proven track record of literally stopping crime in its tracks. Anna is a known tennis fan, so their cover could be that she just HAPPENS to be at the French Open or whatever anyway. (Serena's reasons for being at a tennis tournament are, I hope, quite obvious.) NO ONE would suspect that, in addition to watching/playing tennis, they are ALSO keeping people all over the world safe from nefarious wrong-doers. SOMEONE GET ON THIS.
Anna and Serena
They would also each enjoy taking a moment out of ruling the worlds of tennis, magazines, and crime-fighting to appreciate each other's ensembles. (I am likewise confident they can BOTH run in heels.) For what it's worth, although they kind of look like they're going to different parties -- it's the premiere of a doc about Serena -- they BOTH look good. (I like to think that Serena here is diplomatically not asking Anna why she is SO IN LOVE with those specific shoes.)
Serena Williams
I pulled this photo in large part because I thought it was cute, but also these earrings are FAB.