In later years Koželuh also played for DFC Prag (Prague), Teplitzer FK (Teplice) and Wiener AC (Vienna).

[2][3] In 1925, he was a member of the Czechoslovakia ice hockey team that won the European Championship, scoring the winning goal in the final game.

Koželuh became a professional tennis coach at a fairly young age and thereby made himself ineligible to play in any amateur tournaments.

The American tennis player Vinnie Richards said he was "seamy-faced, cadaverous-looking and, in general, resembled a cigar-store Indian."

When a U.S. professional tour was started, Koželuh was one of the first players to join it, being signed up for it by Vinnie Richards, who made a special trip to Europe for that purpose.

"[4] Bill Tilden, the greatest player of the 1920s, turned professional at the end of 1930 and organized a tour with himself to play the headline match against Koželuh.

Tilden won three straight sets in only 65 minutes, attacking from both the baseline and the net and overwhelming Koželuh with his power.

Koželuh finally won their tenth match on an outdoor concrete court at the Los Angeles Tennis Club.

He went on to win the title again in 1932, defeating the German Hans Nüsslein, and in 1937,[5] beating the American Bruce Barnes at The Greenbrier in West Virginia at the age of 42.