Marek Semjan (Slovak pronunciation: [ˈmarek ˈsemjan]; born 7 November 1987) is a Slovak tennis player playing on the ATP Challenger Tour.

On 30 August 2010, he reached his highest ATP singles ranking of 218.

[1] He won over top seed Fernando Verdasco at the 2012 UniCredit Czech Open in Prostějov in three sets 6–4, 6–7 (5–7), 6–4.

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