Dinara Safina has been confirmed as the new number one in women's tennis, completing a famous double for her family.
Safina, who turns 23 next week, was assured earlier this month of becoming the 19th world number one since the rankings started in 1975, and she's emulated her brother Marat Safin who first became men's number one in 2000.
It's the first time a brother and sister have led the rankings.
