Maria is through to the semis of the TEB BNP Paribas WTA Championships in Istanbul, Turkey after she won her second match against Agnieszka Radwanska of Poland 5-7 7-5 7-5 in three hours and 12 minutes.

In the first set both players held serve until Radwanska broke Maria's serve in the final game to take the set 7-5 in 58 minutes.

Maria broke in the first game of the second set but she couldn't take advantage as Radwanska won four of the next five games to lead 4-2. The momentum changed as Maria then won five of the next six games as she won the set 7-5.

The first break of the third set was won by Maria as she broke Radwanska to lead 3-2. Radwanska broke in the next game to level the set 3-3. Both players held their serves until the eleventh game when Maria got the crucial break to lead 6-5 and had a comfortable hold of serve as she booked her place in the semis at 2.15 AM.

Maria will play her final round robin match against Samantha Stosur of Australia on Friday.