Dinara Safina retires with injury against Jelena Jankovic at wta Championships
Dinara Safina retired with a lower back injury Wednesday against Jelena Jankovic in her first round-robin match at the Sony Ericsson Championships and will lose her No. 1 ranking to Serena Williams if she has to pull out of the tournament.
Former world number one Dinara Safina has retired from professional tennis, according to her brother Marat Safin.