Table:
0
A
B
C
D
E
1
Location
Year
Champion
Runner-up
Score
2
Myrtle Beach
1976
Ilie Năstase
Manuel Orantes
6–4, 6–3
3
Boca Raton
1977
Björn Borg
Jimmy Connors
6–4, 5–7, 6–3
4
Boca Raton
1978
Björn Borg
Jimmy Connors
7–6 (7–1) , 3–6, 6–1
5
Boca Raton
1979
Björn Borg
Jimmy Connors
6–2, 6–3
6
Boca Raton
1980
Björn Borg
Vitas Gerulaitis
6–1, 5–7, 6–1
7
Boca Raton
1981
John McEnroe
Guillermo Vilas
6–7, 6–4, 6–0

Questions and formulas:
Question: What year weas John McEnroe the champion?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="john mcenroe"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,C2:C7="john mcenroe"),2))
Level: medium
Question: Who was the runner-up, when the champion was Björn Borg after 1978?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(C1="björn borg")*(B1>1978)),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,(C2:C7="björn borg")*(B2:B7>1978)),4))
Level: medium
Question: Who was the champion earlier than 1978 when the runner-up was Jimmy Connors?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1="jimmy connors")*(B1<1978)),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,(D2:D7="jimmy connors")*(B2:B7<1978)),3))
Level: medium