A tennis riddle is:
 
Q: What is the loudest sport?
A: Tennis, because everyone raises a racquet (racket).
 
“Why is tennis such a noisy game? Because every player raises a racket” was printed in a 1953 newspaper.
 
“What is the quietest sport?”/“Bowling, because you can hear a pin drop” is a related riddle.
   
 
1 November 1953, Sunday Times Signal (Zanesville, OH), “Puzzles and Pastimes for the Family,” sec. 3, pg. 9, col. 1: 
Why is tennis such a noisy game?
Because every player raises a racket.
 
19 March 1962, Austin (TX) Statesman, “Fun Time—The Riddle Box” by A. Leokum,  pg. 20, col. 5:
Why is tennis such a noisy game?
Because each player raises a racket.
     
Google Books
October 1962, Boys’ Life, “Think and Grin,” pg. 66, col. 2:
Phil: Why is tennis such a noisy game?
Bill: Because each player raises a racket. — Jim Sherman, Buena Park, Calif.
 
18 July 1965, Austin (TX) American-Statesman, “Riddle Me This,” Family Weekly, pg. 13, cols. 1-2:
Why is tennis a noisy game?
Because it can’t be played without raising a racket.
 
6 February 1973, Tucson (AZ) Daily Citizen, “Fun Time—The Riddle Box,” pg. 57, col. 5:
Why is tennis a noisy game?
Because you raise a racquet.
   
Google Books
Biggest Riddle Book in the World
By Joseph Rosenbloom
Illustratiosn by Joyce Behr
New York, NY: Sterling Publishing Company, Inc.
1976
Pg. 94:
What is the loudest sport?
Tennis, because everyone raises a racquet (racket)
 
Google Books
Riddles, Riddles, Riddles
Edited by Darwin A. Hindman
Illustrations by Larry Daste
Mineola, NY: Dover Publications, Inc.
1997
Pg. 30:
Why is tennis such a noisy game?
ANS: Because every player raises a racket.
 
25 June 2000, Poughkeepsie (NY) Journal, pg. 3D, col. 1:
What is the loudest sport?
Tennis. Because everyone raises a racquet (racket).
 
Google Groups: alt.humor.puns
Puns of the Weak 04-18-03
Stan Kegel
4/18/03
(...)
What is the loudest sport?
Tennis, because everyone raises a racquet (Kids Joke).
 
1 July 2007, The Pantagraph (Bloomington, IL), “Riddle Me This,” Flying Horse, comics sec., pg. ?, col. 6:
Q: What is the loudest sport?
A: Tennis. It’s played with a racquet.
 
Twitter
Roger Borchers
‏@RogerBorchers
Triddle of the day ... when plain old Twitter is not enough ... What’s the loudest sport?  TENNIS… BECAUSE ALL THE PLAYERS RAISE A RACKET
4:20 PM - 11 Jun 2009
 
Google Books
Slam-Dunk Sports Jokes:
A Winning Collection of the World’s Best Athletic Jokes
By Paul M Miller
Uhrichsville, OH: Barbour Publishing, Inc.
2013
Pg. ?:
What is the loudest sport?
Tennis, because everyone raises a racquet.
 
Twitter
Dub
‏@DubIsTheName25 Dub Retweeted Brian Mancuso
“What’s the loudest sport?”
“I don’t know what is it?”
“Tennis! You can’t play without raising a racket!“Dub added,
Brian Mancuso @THSouthSports
.@QuakerSports players listening to Stuckey jokes before South/Plainfield game. @IHSAA1 #faceofsportsmanship
5:53 PM - 6 Feb 2016
 
Twitter
Laurel Bill
‏@LaurelBill
Aunt Phil Silly Q&A – Q: What is the loudest sport? A: Tennis, because everyone raises a racquet.
11:03 AM - 7 Sep 2016