Referring to newspaper article ranking tennis players for 1933 http://news.google.com/newspapers?n...2HUyAAAAIBAJ&sjid=87UFAAAAIBAJ&pg=993,1284250 It says that Karel Kozeluh "for years holders of the world's championship recognized by the International Professional Federation..." What was this world's championship that they refer to? Plaa and Nusslein won the World Professioanl Championship in Berlin in 1932 and 1933 respectively, but what was this World Championship they refer to Kozeluh winning? Possible answers I might suggest. Perhaps it wasnt a tournament but the world ranking given to Kozeluh in the pro ranks. Or possibly it could be the Bristol Cup which Kozeluh won many times? http://en.wikipedia.org/wiki/Bristol_Cup#Bristol_Cup Any ideas? Note: Here are some other newspaper articles where Kozeluh referred to as a World professional champion:- http://news.google.com/newspapers?id=9GAzAAAAIBAJ&sjid=QSIEAAAAIBAJ&pg=4198,5424339&dq=kozeluh&hl=en http://trove.nla.gov.au/ndp/del/article/32499434?searchTerm=KOZELUH&searchLimits= http://newspapers.nl.sg/Digitised/Article/straitstimes1931118.104.22.168.aspx http://newspaperarchive.com/kokomo-tribune/1929-10-16/page-15/ http://newspaperarchive.com/ogden-standard-examiner/1931-01-02/page-12 What title established Kozeluh as the World's Professional Champion? The Bristol Cup?