Williams sisters advance in Miami

MIAMI, March 28 (UPI) -- Serena and Venus Williams both won their matches in straight sets Saturday to advance to the third round of the $4.5 million Sony Ericsson Open in Miami.

Serena beat American Alexa Glatch 6-2, 6-3 and Venus defeated Israeli Shahar Peer 6-3, 6-3.

Serena won her second straight -- and fifth overall -- Miami title last year by beating Jelena Jankovic in the final. She also won in Miami from 2002-04.

Serena next plays Peng Shuai of China, who beat Italian Mara Santangelo 7-5, 6-3 Saturday. Venus' next match will be against Germany's Anna-Lena Groenefeld, who beat Italian Sara Errani, 6-4, 6-3.

Venus won this event in 1998, 1999 and 2001, beating Serena in the 1999 finale.

Also Saturday, Russian Vera Zvonareva defeated Italy's Tathiana Garbin 6-4, 6-1.