The Williams sisters have been playing each other in tournaments since the last century. The accolades are too many to count here, though here's a new one: "Serena has been the most prolific Grand Slam winner after age 30 in tennis history."

Nineteen years after their first Grand Slam duel in Australia, here's Venus celebrating about reaching the final match:

To look back, here's the Times reporting on their first Australia match, in 1998:

Today, there were fears that the rank newcomer, 16-year-old Serena, might wreak havoc on the already complicated family pecking order and defeat 17-year-old, 16th-ranked Venus — making good on the prediction by their father, Richard, that the littlest Williams was destined to be the greater champion of the two.

But after a heated beginning in which neither sister gave ground, Serena deferred to her elder and allowed Venus Williams, who made her own Grand Slam breakthrough when she reached the final of the United States Open last summer, to advance into the third round of this one with a 7-6 (7-4), 6-1 victory.

For those of us who believe the Williams sisters are among America's best atheletes of all time, and Serena's possibly the GOAT, here's S.L. Price from 2015, and a social-media heavy "Why Serena Williams is the best athelete of all time", Bill Simmons on the majesty of Serena and the J.J. Sullivan piece on the sisters, and we could go on. Though one rule to live by?