When temperatures drop, the outdoors is no place for tennis skirts and best of threes. Thankfully, we don't have to pack up our rackets: There's lots to love about these three indoor facilities.

A semi-hidden terminal in Grand Central station is home to the new Vanderbilt Tennis Club. Guests enjoy immaculate indoor courts, fully equipped fitness facilities and a lovely place to practice their serves. The enormous windows flood the courts with sunlight during the day and shower them with 42nd Street's glow by night. Hourly rates range from $90 to $200, but beware: Court time books up weeks in advance. 15 Vanderbilt Ave. (at 42nd St.); 212-599-6500 or vanderbilttennisclub.com

Playing with a partner? Check out Sutton East's Friday Night Tennis, which is beloved for its laid-back atmosphere. Sixty-eight dollars gets you three hours of court time, pizza, drinks and props for getting out of the dinner-and-a-movie rut. Book your court a week in advance; the facility is in demand for its location and excellent lighting. 488 E. 60th St. (at York Ave.); 212-751-3452 or suttoneasttennis.com

It may be a schlep, but Sportime on Randall's Island boasts some of the finest facilities in New York. Tennis icon John McEnroe oversees his eponymous 20-court academy and personally recruited every instructor. We especially like his weekly round-robin doubles league, which rewards the strongest players with trophies at the end of each season. One Randall's Island; 212-427-6150 or sportimeny.com

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