Table: mixed_quad_singles_match
Columns: athlete
class
event
round_of_32
round_of_16
quarterfinals
semifinals
final_bronze_medal_match

Question: What is the semifinal result for Dorrie Timmermans-Van Hall?
SQL: SELECT "semifinals" FROM mixed_quad_singles_match WHERE "athlete" = 'Dorrie Timmermans-Van Hall'

Question: What is the round of 16 result for Jiske Griffioen Esther Vergeer?
SQL: SELECT "round_of_16" FROM mixed_quad_singles_match WHERE "athlete" = 'Jiske Griffioen Esther Vergeer'

Question: The semifinal score of vergeer ( ned ) l 0-6, 1-6 follows a round of 16 result of what?
SQL: SELECT "round_of_16" FROM mixed_quad_singles_match WHERE "semifinals" = 'Vergeer ( NED ) L 0-6, 1-6'

Question: How many round of 32 results are followed by Polidori ( Ita ) w 6-1, 3-6, 6-3 in the round of 16?
SQL: SELECT COUNT("round_of_32") FROM mixed_quad_singles_match WHERE "round_of_16" = 'Polidori ( ITA ) W 6-1, 3-6, 6-3'