Azarenka leads their previous meetings 6-1. The most recent was earlier this month. She won on a hard court in straight sets. Kerber’s only “win” was due to Azarenka withdrawing before their match.
Kerber has taken her to 3 sets once. The last time was last year’s US Open. Kerber struggled with her own serve in the opening set against Beck. She won the 2nd set 6-0. She faced 10 bp in that match and was broken 3 times.
This is the first time Kerber has made it to the quarter finals. She has been in the 4th round twice before.
Azarenka has been impressive and hasn’t dropped a set. Strycova put her under the most pressure but still managed just 2 break points which Azarenka saved.
Kerber is going to have to really improve on her serve if she is to have any chance. If she served like she did against Beck then this will be over in 2 sets.
I think Kerber will start quickly so I will wait to back Azarenka if she is broken first.