Who are the bogeywomen of the top players?
When I say bogey women, I don't mean top players who had/have losing records to other top players who are not as great as them, eg Lindsay Davenport leads Monica Seles 10-3. Monica is clearly greater, but Lindsay is still a top player.
I mean random, much lower ranked players, who aren't really "great". Examples include Pironkova 3-1 over Venus, Na Li 2-0 over Venus, Tatiana Golovin 2-0 over Venus, and Anna Kournikova 3-1 over Jennifer Capriati.