Wow, thought Zvonareva had retired. But according to the ITF, she hasn't played at ITF or above for nearly two years.
This, from Aug. 2016, helps fill in the blanks: http://www.wtatennis.com/news/article/5850440/title/catching-up-with-vera-zvonareva A rotten bit of luck for Katie, who might be wishing she'd stayed in Oz. Either she loses to a player who's hardly played in years, and everyone piles in, or she 'only' beats a player that's hardly played for two years, no big deal. She can't really win either way.
Sorry being deliberately obtuse, but I do feel the Russians consider all things political in their neighbouring countries to be domestic political science.
Thanks for all the info. I did see the article on WTA at the time, and knew she had married and had a baby - just was surprised to see her making a comeback.