Table:
0
A
B
C
D
E
F
1
Outcome
Date
Tournament
Surface
Opponent in the final
Score
2
Runner-up
3 Jul 2004
Inchon , South Korea
Hard
Eun-Jeong Lee
0–6 6–3 0–6
3
Runner-up
21 May 2006
Ho Chi Minh City , Vietnam
Hard
Katarina Kachlikova
4–6 4–6
4
Winner
15 July 2007
Miyazaki , Japan
Carpet
Shuai Zhang
6–4 6–2
5
Runner-up
28 October 2007
Hamanako , Japan
Carpet
Yanina Wickmayer
6–4 4–6 2–6
6
Runner-up
26 Apr 2009
Changwon , South Korea
Hard
Elena Baltacha
3–6 1–6
7
Winner
31 May 2009
Gunma , Japan
Carpet
Wen-Hsin Hsu
6–1 6–1
8
Winner
19 July 2009
Miyazaki , Japan
Carpet
Shiho Akita
7–6(6) 6–2
9
Runner-up
2 August 2009
Obihiro , Japan
Carpet
Kurumi Nara
6–7(7) 6–4 4–6
10
Winner
9 May 2010
Fukuoka , Japan
Carpet
Nikola Hofmanova
6–1 6–2
11
Runner-up
30 May 2010
Kusatsu , Japan
Carpet
Akiko Yonemura
4–6 6–7(4)
12
Winner
8 August 2010
Beijing, China
Hard
Shuai Zhang
7–6(3) 6–2
13
Runner-up
28 November 2010
Toyota , Japan
Carpet
Misaki Doi
7–5 6–2
14
Runner-up
30 October 2011
Hamanako , Japan
Carpet
Karolina Pliskova
2–6 6–7(4)
15
Runner-up
27 May 2012
Karuizawa , Japan
Grass
Marta Sirotkina
4–6 6–2 4–6

Questions and formulas:
Question: What date did Namigata play against Wen-Hsin Hsu in the finals?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,E1="wen-hsin hsu"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F15,E2:E15="wen-hsin hsu"),2))
Level: medium