Table:
0
A
B
C
D
E
F
1
!Event
Round
Surface
Winner
Opponent
Result
2
1.
Wimbledon
Final
Grass
Roger Federer
Andy Roddick
3
2.
Madrid
Semifinal
Clay
Rafael Nadal
Novak Djokovic
4
3.
Australian Open
Semifinal
Hard
Rafael Nadal
Fernando Verdasco
5
4.
US Open
2nd Round
Hard
Taylor Dent
Iván Navarro
6
5.
Tour Finals
Semifinal
Hard (i)
Nikolay Davydenko
Roger Federer

Questions and formulas:
Question: Which Surface has a Result of fernando verdasco?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,F1="fernando verdasco"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,F2:F6="fernando verdasco"),3))
Level: medium
Question: How many events did clay win?
Formula: SUMIFS(A1,D1,"clay")
Formula2: SUMIFS(A2:A6,D2:D6,"clay")
Level: easy
Question: Which Surface has an Opponent of rafael nadal, and an Event of 2?
Formula: LET(query1,LET(query1,FILTER(A1:F1,E1="rafael nadal"),SUMMARIZE(CHOOSECOLS(query1,3),SUMX(CHOOSECOLS(query1,1)))),FILTER(query1,CHOOSECOLS(query1,2)=2))
Formula2: LET(query1,LET(query1,FILTER(A2:F6,E2:E6="rafael nadal"),SUMMARIZE(CHOOSECOLS(query1,3),SUMX(CHOOSECOLS(query1,1)))),FILTER(query1,CHOOSECOLS(query1,2)=2))
Level: hard
Question: Who is iván navarro's opponent?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,F1="iván navarro"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,F2:F6="iván navarro"),5))
Level: medium
Question: Which Event has a Surface of semifinal, and a Winner of hard (i)?
Formula: SUM(FILTER(A1, (C1="semifinal")*(D1="hard (i)")))
Formula2: SUM(FILTER(A2:A6, (C2:C6="semifinal")*(D2:D6="hard (i)")))
Level: easy