Tennis power duo Venus and Serena Williams both crushed their opponents in the Wimbledon quarterfinals this week, leaving them each one win away from competing against each other in the finals. If that happens, they'll both wind up victors.

No matter which sister wins, a Williams vs. Williams face-off in the finals will guarantee the sisters their 29th grand slam championship in 17 years. In fact, the Williams sisters combined have won almost half of the last 67 grand slams — 28 Williams sisters victories to 39 for everyone else. 

And the pair is equally impressive when playing together: They’ve won 13 Grand Slams and three Olympic gold medals as a doubles team.

The finals match is slightly more stressful for Serena, who's vying for a record-tying 22 Grand Slam titles. The world's number-one-ranked player hopes to obliterate Steffi Graf's 1999 record on July 9. And she already pushed into second place for the record number of Grand Slam match wins on Sunday, notching her 300th victory.

"I had no idea," Serena said in a post-match interview about the milestone. "That's awesome, right? That's good, right? I think that's a lot of matches."

Meanwhile, 36-year-old Venus is competing in her 19th Wimbledon this year, and is the oldest Grand Slam semi-finalist in 22 years. Serena says she's rooting for sister to win the final — as long as she isn't on the court herself.

"Obviously I want her to win so bad — not in the final, if I'm there," she told BBC Sport. "But If I'm not there, I desperately want her to win."