Table:
0
A
B
C
D
E
1
Date
Tournament
Surface
Opponent
Score
2
July 21, 2008
ITF / Lexington, Kentucky
Hard
Carly Gullickson
6–4, 6–2
3
May 10, 2009
ITF / Indian Harbour Beach , Florida
Clay
Laura Siegemund
7–5, 5–7, 6–2
4
May 17, 2009
ITF 50k / Raleigh, North Carolina
Clay
Lindsay Lee-Waters
6–1, 2–6, 6–4
5
April 29, 2012
ITF 50k / Charlottesville, Virginia
Clay
Irina Falconi
7–6(0), 3–6, 6–1
6
November 4, 2012
ITF 50k / New Braunfels, Texas
Hard
Mariana Duque
6–1,6–1

Questions and formulas:
Question: Which opponent was on July 21, 2008?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="july 21, 2008"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,A2:A6="july 21, 2008"),4))
Level: medium
Question: What was the date of the tournament with a clay surface and an opponent of Irina Falconi?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(C1="clay")*(D1="irina falconi")),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,(C2:C6="clay")*(D2:D6="irina falconi")),1))
Level: medium
Question: Who was the opponent on May 10, 2009?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="may 10, 2009"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,A2:A6="may 10, 2009"),4))
Level: medium