The American-Czech duo is the fourth team to qualify for Singapore
World No. 2 put to the test on her own achievements.
American Mackenzie MacDonald comes up with an incredible bit of improv at the Tiburon Challenger.
The Romanian will make a third consecutive trip to Singapore.
Rafael Nadal stops play until a frantic mother finds her daughter.
World No. 4 offers interesting explanation for Russian No. 1's success.
Former world No. 1 shows her skills in Brooklyn.