Why don't tennis players wear sunglasses?
Only a few do. When it's sunny, I can't play tennis without them, because the sun distracts me so much and makes me squint. Or when you play facing the sun, and if you serve or the ball goes high, it's impossible to hit it without becoming "blind" for several seconds. Do tennis players close their eyes when hitting?
Players play in many sunny locations, like AO, Madrid, Miami, etc., where the sun is CRAZY.
...Or their eyes are different?