Who, in your mind, is currently the 3rd best player?

I'm talking current 3rd best female tennis player, not ranking, just in case someone needs clarification.
Let me go by elimination.

- If Serena is playing anyone and is healthy, I expect her to win. So, in my mind, she's the best player right now.

- If Venus is playing anyone but Serena, and is healthy, I expect her to win. So, in my mind, she's the second best player right now.

- If Clijsters is playing anyone but Serena and Venus, and is healthy, I expect her to win. So, in my mind, she's the third best player right now.

- As for the fourth best, I don't have any solid expectation but Justine does come to mind as well as Davey, Cappy and Momo.

As a side point, when the first and second best don't or can't play due to various reasons including illness, why can't we accept that it behoves the third best to take the helm and be #1?