The short answer to your question is yes, but not many, and none of the newer properties have courts (we thought CityCenter might somewhere, but no, and Wynn/Encore directed us to a tennis club with which they have an arrangement.)
As it turns out, it's only the older hotel-casinos that have courts, dating back to the original "daylife" era of the '50s and '60s, when sportiness ruled and guests lounged by the pool or knocked a ball around by day, before donning evening dress for a night on the town.
Space wasn't at such a premium back then, either, whereas now a tennis court would be considered a far-from-optimal space:guest ratio. Yes, pools take up a lot of space too, but if you've seen the crowd at, say, Hard Rock's Rehab, TAO Beach, Ditch Friday at the Palms, or Wet Republic at MGM Grand, then you'll understand that rarely have more bodies been squeezed into more confined spaces since the Black Hole of Calcutta. And these bodies are spending gargantuan amounts of money on cabanas and booze, too, whereas a leisurely $12 round of tennis doesn't really cut it.
All is not lost for you tennis fans, however, and we did find a few options for you. Strip-wise, Bally's has outdoor courts (all the courts we found are outdoor), which run at $12/hour for hotel guests or $20 for non-guests. The Flamingo also has tennis courts, which are $20/hour to use for guests, $25 for non-guests. The Riviera's courts are guest-only but free to use.
Off the Strip, you can check out the Las Vegas Hilton, where rates vary seasonally to use the courts. Right now it's $20/hr for guests or $25 for non-guests, including balls. Call 702/732-5009 for more information. The Plaza downtown has tennis courts on the fifth floor of the South Tower, which are free for guests to use. Allegedly, there's a fee for non-guests, but security assured us that they really don't bother monitoring who's using the courts, so you should get away with it.
Other options include public courts, which can often be cheaper than the hotel options. Desert Palm Tennis Club (3090 S. Jones Blvd.) charges $20 for a 90-minute court rental and is open daily. Sunset Park (2601 E. Sunset) operates on a first come, first served basis. You can reserve a court for $3/hr, but when we called to research this at 5 p.m. on a Wednesday, we were informed that all eight courts were empty, so there was little need to reserve a slot. Lastly, the Amanda & Stacy Darling Memorial Tennis Center (7901 W. Washington Ave.) charges $2.50 per person, per hour during daylight hours; that goes up to $3.50/hr at night when the courts are lit. They're open until 9 p.m. on weekday nights, 7 p.m. on Saturday, and 5 p.m. on Sunday.
If anyone knows of any other options we've missed, let us know and we'll add them as updates to this answer.
