I take on board the points that philwrig & Coup Droit make above. Certainly this would be more valuable later in the season, with more data points, which would smooth out individual special circumstances to better show underlying patterns.
There are now two pages, you can switch between them using the text buttons at the top.
I'll not state my conclusions, but instead leave you to draw your own. https://public.tableau.com/profile/publish/NaomiBroadyYTD2016/NaomiBroadyin2016
Thanks to LongTimeReader & especially kundalini, for help with the data The WTA stats are from the official data, so I'd hope that was right.
Not to take away from Ms Vesnina, but my understanding was that Halep probably shouldn't be playing (and originally was not going to play) this tournament.
For those that bemoan the lack of variety in the game, especially the women's game, today provided an exception you might savour, as Aga Radwanska & Monica Niculescu sought to play every shot in the book, often in a single rally. You can see brief highlights (3:11), here.