Serena Williams returned to tournament tennis after a two-month absence and beat Zhang Shuai of China 6-2, 6-3 at the Sony Ericsson Open on Thursday. No. 2-seeded Maria Sharapova overcame 12 double faults and erased 10 break points to rally past Shahar Peer of Israel 4-6, 6-3, 6-3, while No.
