It is a tale of contrasting fortunes building up to the US Open for the current world number one and a woman looking capable of taking back that spot.
Current world number one Caroline Wozniacki has been having a nightmare time and suffered a second successive early exit from the Western and Southern Open.
The Dane lost 6-4 7-5 to American teenager Christina McHale in Cincinnati and that came only a week after a first round exit in Toronto. Those who bet on US Open
action will have been unimpressed.
Wozniacki is still searching for her first ever Grand Slam win but she is not looking in great form to put up a major challenge at the coming US Open.
The star herself admits she would prefer to have more matches under her belt going into the final Grand Slam of the season and is now planning to "train even harder" to turn things around.
Compare that to former number one Serena Williams, who is having a resurgence after a year out through injury and has won two consecutive competitions – while she is also impressing at the Western and Southern Open.
The 13-time Grand Slam winner has the opposite worry to Wozniacki and admits she is concerned about potential burn-out coming into the US Open – something she claims she has to "figure out" before Flushing Meadow.
"Nothing against Cincinnati or Toronto or the Stanfords that I've played, but everyone is preparing for the U.S. Open. I have to be smart and make sure it's not too much," said Serena.
It Williams continues the form she has shown in recent weeks she is capable of blowing away all opponents at the US Open, while Wozniacki's long wait for a Grand Slam looking set to continue.
Meanwhile, anyone looking to bet on Andy Murray
will be keeping a close eye on his form.