The courts at the Australian Open are made of a manufactured surface called Rebound Ace. It is an acrylic surface because irrespective of what's beneath it, what the players stand on is made of ...

(AP Photo/Louise Delmotte, File) Ball kids dry Margaret Court Arena as rain interrupted second round matches at the Australian Open tennis championships at Melbourne Park, Melbourne, Australia, on Jan ...

When Pegula lost Friday, she complained of slow conditions on the court. Sabalenka has noted it as well -- but not everyone feels that way.