Sentence:  The Court itself, with its rent, the wages of the <WSD>Marker</WSD> and the tips to the <WSD>Marker</WSD>, the rackets and the balls, the baths and the flannels and the washing of the flannels, do much to account for the costliness of play. 
Meaning of the word marked with <WSD> tags:  A player employed by a private club and available to compete against members.