The biggest Problem of WTA nowadays.
IMO it's the inconsistency of TONS of players. Young hopes like Lisicki, Pavlyuchenkova, Rezai and Kleybanova seem unable to produce a string of good results, which would make you believe that they're really capable of doing something great in the WTA-Circuit. On a good day, they can beat Top-10, on another day they lose to Top 100. After 1 good Tournament they lose in the 1R of the next Tournament. They play well for maybe 4 Tournaments in a year. Even Wickmayer who had some consistent results over the past weeks had some bad 1R losses now.
But it's not only with the young guns. Petrova, Razzano, Stosur and Zheng are all Top 20 players with 0 consistency. And then there is a couple of players who have a post-AO-crisis. After playing well down under, there isn't much on with them now. Zheng, Bondarenko, Petrova, Kirilenko...
There are only a few really reliable players at the tour at the moment. And this is the sad thing in my Opinion. The Top 20 was really bigger in past years.
N. VAIDISOVA - T. GOLOVIN - A. BONDARENKO - A. SZAVAY
D. HANTUCHOVA - A. PAVLYUCHENKOVA - E. VESNINA - E. SVITOLINA
J. GOERGES - A. WOZNIAK - Y. WICKMAYER - E. BOUCHARD - Ka. PLISKOVA