Czech Republic–Slovakia relations
Before 1918, both countries were part of Austria–Hungary. However, after the Ausgleich of 1867 Czechia belonged to the Austrian Empire while Slovakia belonged to the administratively separate Kingdom of Hungary, and between 1918 and December 31, 1992, both countries were part of Czechoslovakia. 
Both countries established diplomatic relations on January 1, 1993. These international relations are usually referred to or described as "very good", "cordial", and "above standard" in the media. When a Czech or Slovak president is inaugurated, very often his first international visit is to the former part of the common country. The same custom applies to newly elected prime ministers of the Czech Republic and Slovakia.
Slovak Super Liga
Slovakia was part of Czechoslovakia (1918–1993). First Slovak championship Zväzové Majstrovstvá Slovenska was played between Slovak teams (1925–1933). Until 1935-36, no Slovak team played in the Czechoslovak (professional, state) league. During German occupation of Czechoslovakia Czech and Slovak clubs were competed in their own, separate competitions. The sole Slovak club in the league, ŠK Bratislava, was removed from the league and joined a new Slovak league, the Slovenská liga (1939–1945), in the newly independent Slovak Republic.