World No. 1 Serena Williams cruised into the third round of the Miami WTA and ATP Masters hardcourt tournament on Thursday with a 6-1, 6-1 victory over Italian Flavia Pennetta.

Williams saved all seven break points she faced and broke Pennetta five times. She had the Italian under pressure often — giving herself 18 break points.

Williams next faces Japan’s Ayumi Morita, a 7-6 (7/2), 2-6, 6-3 winner over Belgian Yanina Wickmayer.