A daughter of Charles and Anais Lenglen, Suzanne Lenglen was born in Paris. During her youth, she suffered from numerous health problems including chronic asthma, which also plagued her at a later age. Because his daughter was so frail and sickly, Charles Lenglen, the owner of a carriage company, decided that it would be good for her to compete in tennis and gain strength. Her first try at the game was in 1910, when she played on the tennis court at the family property in Marest-sur-Matz.

The first major female tennis star to turn professional, Lenglen was paid US$50,000 by American entrepreneur Charles C. Pyle to tour the United States in a series of matches against Mary K. Browne. Browne, winner of the US Championships from 1912 to 1914, was 35 and considered to be past her prime, although she had reached the French final earlier that year (losing to Lenglen 6-1, 6-0).  For the first time in tennis history, the women's match was the headline event of the tour (which also featured male players). In their first match in New York City, Lenglen put on a performance that New York Times writer Allison Danzig lauded as "one of the most masterly exhibitions of court generalship that has been seen in this country." When the tour ended in February 1927, Lenglen had defeated Browne, 38 matches to 0. She was exhausted from the lengthy tour, and a physician advised Lenglen that she needed a lengthy period away from the game to recover.  Instead, Lenglen chose to retire from competitive tennis to run a Paris tennis school, which she set up with the help and money of her lover Jean Tillier. The school, located next to the courts of Roland Garros, slowly expanded and was recognised as a federal training centre by the French tennis federation in 1936. During this period, Lenglen also wrote several books on tennis.  Lenglen was criticised widely for her decision to turn professional, and the All England Club at Wimbledon even revoked her honorary membership. Lenglen, however, described her decision as "an escape from bondage and slavery" and said in the tour programme, "In the twelve years I have been champion I have earned literally millions of francs for tennis and have paid thousands of francs in entrance fees to be allowed to do so.... I have worked as hard at my career as any man or woman has worked at any career. And in my whole lifetime I have not earned $5,000 - not one cent of that by my specialty, my life study - tennis.... I am twenty-seven and not wealthy - should I embark on any other career and leave the one for which I have what people call genius? Or should I smile at the prospect of actual poverty and continue to earn a fortune - for whom?" As for the amateur tennis system, Lenglen said, "Under these absurd and antiquated amateur rulings, only a wealthy person can compete, and the fact of the matter is that only wealthy people do compete. Is that fair? Does it advance the sport? Does it make tennis more popular - or does it tend to suppress and hinder an enormous amount of tennis talent lying dormant in the bodies of young men and women whose names are not in the social register?"

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