Martina will fall to #6 (probably)
Martina will not be defending points at Amelia Island and Charleston, so she'll drop to around 3370.
That means that Kim will be ahead of her.
Monica has around 3320
Serena has around 3280.
Monica and Serena both have no points to defend. (Monica is playing both, Serena only Charleston). They both stand a very good chance of passing her.
Martina has a chance to catch up in the red clay, however.