Now that the careers of Serena and Venus Williams have possibly peaked – just ask Sloane Stephens, the American teen who just knocked Serena out of the Australian Open – is this the time to look back? Serena, 31, will be remembered as the more accomplished player, with 15 Grand Slams to her name thus far. She’s been world No. 1 five times. Older sis Venus, 32, has so far won seven Slams and been ranked No. 1 on three occasions. They’ve played against each other 23 times, with Serena holding a 13-10 advantage. What’s more, they’re the only women in the open era to have played against one another in four consecutive Grand Slam finals; overall, Serena holds a 6-2 lead in Slam finals. Perhaps no siblings have dominated their sport, for so long, as the Williams sisters.