Mateusz Kowalczyk (Polish pronunciation: [maˈtɛ.uʂ kɔˈvalt͡ʂɨk]; born 3 May 1987) is a Polish tennis player who specialises in doubles.

He reached his highest doubles ranking of world no.

He has played with Tomasz Bednarek, Błażej Koniusz, Marcin Gawron, and Artem Sitak.

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