Dinara Safina, the younger sister of Marat Safin, reached World No. 1, joining her brother at the top of the tennis world.

Since early February, the world No. 8 has been working with Dinara Safina's ex-coach Davide Sanguinetti, who confirmed that he has nothing against Vukov's presence.

Her 2011 season was highlighted by a series of impressive performances and tournament victories. – **Dinara Safina** is a unique case, having amassed 10,521 points in July 2009 without winning a Grand ...