“What number is a sport?”/“Ten is.”

A tennis riddle is:
 
Q: What number is a sport?
A: Ten is.
 
The riddle was printed in many newspapers in 1958.
 
   
Newspapers.com
12 December 1958, Daily Intelligencer Journal (Lancaster, PA), “Fun Time—The Riddle Box,” pg. 51, col. 3:
What number is also a popular sport?
Ten-is.
 
Newspapers.com
19 April 1962, Vancouver (BC) Sun, “Sun-Ray Riddles” submitted by Janet Patterson, pg. 38, col. 4:
Q. What number is also a popular sport?
A. Ten is (tennis).
 
Twitter
Paul Oswell
@Shandypockets
What number is a sport? TEN IS! Glad I woke up for this Wimbledon semi. Kind of ridiculous.
12:12 PM · Jul 5, 2013·TweetDeck
     
Reddit—Dadjokes
Posted by u/Colinmacus September 28, 2017
What number is also a sport?
Ten is.
   
Reddit—Dadjokes
Posted by u/topknottington March 1, 2020
What number is a sport?
Ten is
 
Twitter
Ralph Nelson Willett
@NorthernOvation
Q:  What number is a sport?
A:  Ten is. 
#dadjoke
12:33 PM · Mar 1, 2020·Twitter Web App
 
Twitter
⸝⸝ 𝗀𝗋𝖺𝖼𝖾 ⁷
@seemsgay
what number is a sport?
ten is.
11:41 PM · Mar 1, 2020·Twitter Web App
 
Twitter
Jay Lim 임병준
@aQuoteAday
What number is a sport?
Ten is.
#DadJokes
12:57 AM · Mar 6, 2020·Twitter Web App
 
Twitter
Talk To The Hatter
@Talk_To_The_Hat
What number is a sport?
Ten is
#HatDadJoke
1:21 PM · Mar 7, 2020·Twitter Web App