2013 UniCredit Czech Open – Doubles
Hsieh Cheng- peng and Lee Hsin- han were the defending champions but decided not to participate .< br>
Nicholas Monroe and Simon Stadler defeated Mateusz Kowalczyk and Luká š Rosol 6 – 4, 6 – 4 in the final to win the title.
2018 Sopot Open – Doubles
This was the first edition of the tournament.
Mateusz Kowalczyk and Szymon Walków won the title after defeating Ruben Gonzales and Nathaniel Lammons 7 – 6, 6 – 3 in the final.
2018 Poprad-Tatry ATP Challenger Tour – Doubles
Mateusz Kowalczyk and Andreas Mies were the defending champions but chose not to defend their title.
Tomislav Brkić and Ante Pavić won the title after defeating Nikola Čačić and Luca Margaroli 6 – 3, 4 – 6,[ 16–14] in the final.
Artur Szeliski
Artur Szeliski( born 28 October 1979 in Gdańsk) is a Polish ice dancer.
He competed with Molly Marcon, with whom he was the 2002 Polish national silver medalist.
He previously skated with Luiza Kowalczyk and Diana Chabros.
2013 Marburg Open – Doubles
Mateusz Kowalczyk and David Škoch were the defending champions, but decided not to participate.
< br> Andrey Golubev and Evgeny Korolev defeated Jesse Huta Galung and Jordan Kerr 6 – 3, 1 – 6,[ 10 – 6] in the final.
2015 MercedesCup – Doubles
Mateusz Kowalczyk and Artem Sitak were the defending champions, but chose not to participate this year.
Rohan Bopanna and Florin Mergea won the title, defeating Alexander Peya and Bruno Soares in the final 5 – 7, 6 – 2,[ 10–7].
Mateusz Kowalczyk
Mateusz Kowalczyk( born 3 May 1987) is a Polish tennis player who specialises in doubles.
Czesław Mroczek
Czesław Mroczek( born July 20, 1964 in Kałuszyn) is a Polish politician.
He was elected to the Sejm on September 25, 2005 getting 8311 votes in 18 Siedlce district, candidating from the Civic Platform list.
He was reelected with 33,207 votes.
2016 Sparkassen Open – Doubles
Sergey Betov and Mikhail Elgin were the defending champions but only Betov returned, partnering Tomasz Bednarek.
Betov lost in the quarterfinals to Mateusz Kowalczyk and Antonio Šančić.
James Cerretani and Philipp Oswald won the title after defeating Mateusz Kowalczyk and Antonio Šančić 4 – 6, 7 – 6,[ 10 – 2] in the final.
2016 Sparta Prague Open – Doubles
Mateusz Kowalczyk and Igor Zelenay were the defending champions, but chose not to defend their title.
Tomasz Bednarek and Nikola Mektić won the title after defeating Zdeněk Kolář and Matěj Vocel 6 – 4, 5 – 7,[ 10 – 7] in the final.

Question: Were Mateusz Kowalczyk and Czesław Mroczek of the same nationality?