Table:
0
A
B
C
D
E
F
1
Outcome
Date
Championship
Surface
Opponent in the final
Score in the final
2
Winner
1969
Caracas, Venezuela
Clay
Mark Cox
8–6, 6–3, 2–6, 6–4
3
Winner
1969
Washington, U.S.
Hard
Arthur Ashe
7–5, 9–7, 4–6, 2–6, 6–4
4
Winner
1971
Caracas, Venezuela
Clay
Manuel Orantes
7–6, 6–1, 6–3
5
Runner-up
1976
Khartoum, Sudan
Hard
Mike Estep
4–6, 7–6, 4–6, 3–6
6
Runner-up
1976
Nuremberg, Germany
Carpet
Frew McMillan
6–2, 3–6, 4–6

Questions and formulas:
Question: Tell me the total number of date for carpet
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,D1="carpet"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,D2:D6="carpet"),2))
Level: medium
Question: Tell me the opponent for 6–2, 3–6, 4–6
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,F1="6–2, 3–6, 4–6"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,F2:F6="6–2, 3–6, 4–6"),5))
Level: medium