Wimbledon girls' doubles champion Sania Mirza and Natallia Dziamidzenka beat Jenni Lee Heinser and Jenifer Stevens of USA 6-1, 6-0 in the women's doubles pre-quarterfinals of the Boca Ratan Winter Classic ITF World Ranking Tennis tournament at Florida, USA.

Sania and her partner faced little challenge from their opponents in the first set as they raced to victory after dropping one game. In the second set, they blanked the hosts pair to move into the last eight.

Sania will play her singles match later in the night. She entered the last 16 stage defeating Great Britain's Chantal Coombs 6-3, 6-4.