1.   Moments later, he returned to ask the thousands of fans present to clear the center court stadium as a precaution.

2.   The Australian Open has a sliding roof on its center court stadium and is building another on its main show court.

3.   The Swedish fans in the center court stadium went wild.

4.   He said the sliding roof system over the centre court stadium would be shut for the day session, which included three singles quarter final matches.