Table:
0
A
B
C
D
E
1
Outcome
Date
Championship
Opponent in the final
Score in the final
2
Runner-up
23 July 1972
Columbus, Ohio , U.S.
Jimmy Connors
5–7, 3–6, 5–7
3
Runner-up
30 July 1972
Tanglewood , USA
Bob Hewitt
6–3, 3–6, 1–6
4
Runner-up
14 August 1972
Montreal, Canada
Ilie Năstase
4–6, 3–6
5
Winner
8 April 1974
Monte Carlo , Monaco
Ilie Năstase
5–7, 6–3, 6–4
6
Winner
15 April 1974
Johannesburg , South Africa
John Alexander
6–3, 7–5
7
Runner-up
28 October 1974
Vienna, Austria
Vitas Gerulaitis
4–6, 6–3, 3–6, 2–6
8
Runner-up
7 January 1976
Columbus, Ohio, U.S.
Arthur Ashe
6–3, 3–6, 6–7(4)
9
Runner-up
8 February 1976
Dayton, Ohio , U.S.
Jaime Fillol Sr.
4–6, 7–6, 4–6
10
Winner
14 September 1977
Laguna Niguel , U.S.
Colin Dibley
2–6, 7–6, 6–4
11
Winner
27 November 1979
Johannesburg, South Africa
Víctor Pecci
2–6, 6–3, 6–2, 6–3
12
Runner-up
7 July 1980
Newport, Rhode Island , U.S.
Vijay Amritraj
1–6, 7–5, 3–6

Questions and formulas:
Question: Who was the opponent in the championship in Johannesburg, South Africa?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="johannesburg, south africa"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E12,C2:C12="johannesburg, south africa"),4))
Level: medium