SHOOT: This is one of those 'seeing-is-believing' things.
Yahoo.com: What happened is that the stifling temperatures in Melbourne caused a heat bubble filled with air to form under the surface of the court. It's the same concept that causes crust bubbles to develop on edges of pizza slices. As the Mirror reported, workers came out and drilled two small holes in the court, which let out the air. Order, and gravity, was restored.
Sharapova went on to win the match, 4-6, 6-4, 6-4 to advance to the fourth round.