WIMBLEDON, England—Her 19th consecutive victory at the All England Club already wrapped up, Venus Williams grabbed a seat and watched younger sister Serena win easily to reach the semifinals, too.

Afterward, Venus and Mom, Oracene Price, strolled out of Centre Court arm-in-arm, chatting and laughing.

Sure is fun to be a Williams at Wimbledon.

Five-time champion Venus beat No. 11-seeded Agnieszka Radwanska of Poland 6-1, 6-2, before two-time champion Serena defeated No. 8 Victoria Azarenka of Belarus 6-2, 6-3, a pair of overwhelming performances Tuesday that ...

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