I WONDER - Were Tennis Balls Always Yellow?

The video discusses the invention of the first tennis ball by Charles Goodyear in the 1850s, initially made entirely of rubber. To improve durability, the balls were later covered in flannel. In 1986, Wimbledon introduced the neon yellow ball for better visibility on TV.

In what year did the neon yellow tennis ball first appear at Wimbledon?

What was the reason for choosing the color yellow for the tennis ball?