Williams sisters on track for calendar-year Grand Slam

Question

After winning the women's doubles titles at the Australian Open and Roland Garros, Venus and Serena Williams will arive in Wimbledon with the chance to move one step closer to completing a calendar year Grand Slam.

And having won the doubles title at the All England Club for the previous two years, the world's No. 1 ranked doubles pair look to be on track to do it.

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