The most competitive stretch of the WTA's clay-court season begins today (April 21) as the Porsche Tennis Grand Prix in Stuttgart, Germany gets underway.
It's the first in a series of premier events that lead to the French Open.
Uncertainty surrounds the top ranked players. A tired and injured Serena Williams is 0-1 on clay after being upset at the Family Circle Cup. Victoria Azarenka, also injured, hasn't played since Indian Wells.
Meanwhile, other players have inserted themselves into contention talk and the power rankings.
Unlike the WTA rankings, which include points accumulated last year, power rankings are about who is hot now. The points race in the road to the WTA Championships in Singapore count for more when it comes to power rankings. Then add the intangibles. Who has the momentum, motivation and determination to succeed during this stretch?
Some highly ranked players failed to make cut. This includes Sloane Stephens, who, although ranked inside the top 20, has played miserably this year.
Andrea Petkovic, ranked outside the top 20, has played her way into the power rankings. Who else?