Jelena Jankovic booked her place in the last four of the BNP Paribas Open . The Serbian was a surprise entry into the tournament after she had been eliminated from Wimbledon by world number one Serena Williams on Tuesday. Serena Williams takes on Simona Halep in the semis on Friday .
Jelena Jankovic booked her place in the last four of the BNP Paribas Open . Opponent Lesia Tsurenko retired through injury while trailing 6-1 , 4-1 . Serena Williams takes on Simona Halep in the semis on Friday .