From Longman Dictionary of Contemporary Englishtennis/golf/swimming etc professionaltennis/golf/swimming etc professionalDSBOsomeone who is very good at a sport and is employed by a private club to teach its members → professional
Examples from the Corpus
tennis/golf/swimming etc professional• He was, as golf professionals had been for a hundred years, a serf.• Barry Wood reports Pam Shriver has always been one of the most colourful tennis professionals.• For further details on the Wilson range for ladies, contact your local golf professional.• From the inter-war years a small number of tennis professionals played tournaments in the United States. 