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Date
Winner
Loser
Tournament
Round
Score
2021-06-21
Petra Kvitova (12)
Katarzyna Piter (387)
Bad Homburg
R32
4-6 6-1 6-4
2018-05-21
Zarina Diyas (53)
Katarzyna Piter (384)
Strasbourg
R32
6-2 6-4
2017-02-11
Ivana Jorovic (148)
Katarzyna Piter (212)
Fed Cup G1 PPO: POL vs SRB
RR
6-2 4-6 6-4
2017-02-10
Katarzyna Piter (212)
Tamira Paszek (180)
Fed Cup G1 RR: POL vs AUT
RR
6-2 6-4
2017-02-10
Katarzyna Piter (212)
Ekaterine Gorgodze (325)
Fed Cup G1 RR: POL vs GEO
RR
5-7 6-2 6-4
2016-09-19
Anna Karolina Schmiedlova (100)
Katarzyna Piter (275)
Seoul
R32
6-3 6-2
2014-09-15
Misaki Doi (88)
Katarzyna Piter (122)
Guangzhou
R32
5-7 6-4 6-3
2014-09-08
Alison Van Uytvanck (91)
Katarzyna Piter (122)
Hong Kong
R32
6-2 6-1
2014-08-25
Aleksandra Krunic (145)
Katarzyna Piter (111)
US Open
R128
6-4 6-1
2014-07-21
Bojana Jovanovski (40)
Katarzyna Piter (120)
Baku
R16
6-3 6-1
2014-07-21
Katarzyna Piter (120)
Kristyna Pliskova (94)
Baku
R32
6-7(4) 6-3 6-4
2014-07-14
Annika Beck (64)
Katarzyna Piter (101)
Bastad
R32
6-3 4-6 6-3
2014-07-07
Polona Hercog (61)
Katarzyna Piter (104)
Bucharest
R16
6-2 5-7 7-6(4)
2014-07-07
Katarzyna Piter (104)
Cristina Andreea Mitu (211)
Bucharest
R32
6-0 1-6 7-6(5)
2014-06-23
Andrea Petkovic (20)
Katarzyna Piter (101)
Wimbledon
R128
6-1 6-4
2014-05-26
Angelique Kerber (9)
Katarzyna Piter (95)
Roland Garros
R128
6-3 6-1
2014-04-07
Camila Giorgi (69)
Katarzyna Piter (98)
Katowice
R32
6-0 6-1
2014-03-17
Paula Ormaechea (75)
Katarzyna Piter (100)
Miami
R128
7-6(0) 6-1
2014-02-17
Klara Koukalova (35)
Katarzyna Piter (110)
Rio de Janeiro
QF
6-4 6-0
2014-02-17
Katarzyna Piter (110)
Dinah Pfizenmaier (88)
Rio de Janeiro
R16
5-7 6-3 6-1
2014-02-17
Katarzyna Piter (110)
Beatriz Haddad Maia (287)
Rio de Janeiro
R32
6-3 6-3
2014-01-13
Simona Halep (11)
Katarzyna Piter (119)
Australian Open
R128
6-0 6-1
2013-10-14
Annika Beck (57)
Katarzyna Piter (144)
Luxembourg
QF
6-3 6-7(3) 7-6(5)
2013-10-14
Katarzyna Piter (144)
Yanina Wickmayer (63)
Luxembourg
R16
3-6 6-1 6-4
2013-10-14
Katarzyna Piter (144)
Kirsten Flipkens (20)
Luxembourg
R32
6-4 6-2
2013-10-07
Dominika Cibulkova (23)
Katarzyna Piter (158)
Linz
R16
6-0 6-1
2013-10-07
Katarzyna Piter (158)
Irina Camelia Begu (111)
Linz
R32
6-2 4-6 6-3
2010-05-17
Na Li (12)
Katarzyna Piter (339)
Warsaw
R16
6-0 6-3
2010-05-17
Katarzyna Piter (339)
Marta Domachowska (157)
Warsaw
R32
7-6(3) 4-6 7-5
2009-05-18
Alona Bondarenko (39)
Katarzyna Piter (449)
Warsaw
R32
6-0 6-0
2009-02-07
Elena Baltacha (108)
Katarzyna Piter (419)
Fed Cup G1 PO: GBR vs POL
RR
6-4 6-1
2009-02-06
Katarzyna Piter (419)
Dijana Stojic ()
Fed Cup G1 RRB: BIH vs POL
RR
6-1 6-1
2009-02-05
Katarzyna Piter (419)
Johanna Larsson (178)
Fed Cup G1 RRB: SWE vs POL
RR
6-4 1-6 6-4
2009-02-04
Monica Niculescu (47)
Katarzyna Piter (419)
Fed Cup G1 RRB: ROU vs POL
RR
6-1 6-4
2007-04-30
Nadia Petrova (9)
Katarzyna Piter ()
Warsaw
R32
6-3 7-5