Chart shows just how much Serena and Venus Williams have dominated the tennis world

Venus and Serena Williams won their Australian Open semifinal matchups and will now face each other in the final of a Grand Slam for the ninth time. The matchup also guarantees that the Williams sisters will win their 30th Grand Slam combined.

At the French Open in 1999, Steffi Graf won her 22nd and final Grand Slam title. Three months later, Serena Williams won the U.S. Open, the first of 22 Grand Slam titles, tied with Graf’s Open Era record. Ten months after Serena’s first title, Venus picked up her first of seven grand slams, winning the 2000 Wimbledon.

During the 18 years since Graf won her last slam, there have been 70 Grand Slams and on Saturday, the Williams sisters will have won 43% of them. That is domination.

Venus Williams and Serena Williams at the Grand Slams.Cork Gaines/Business Insider