When they step onto Wimbledon's grass courts on Monday, Venus and Serena Williams will begin their first Grand Slam match against one another since 2009.
Overall, the sisters have played each other a total of 25 times, with Serena, 33, leading 14-11 in the series. But it has already been 15 years since the pair first played against each other at Wimbledon -- all the way back in the 2000 semifinals. Venus, now 35, won the match 6-4, 7-6 (7-3) and would go on to win her first of five Wimbledon titles.
But in celebration of today's match and the siblings' longevity, here's a look back at Venus and Serena playing in that first Wimbledon match in 2000, when they were just 20 and 19, respectively.