Painful to watch!
I don't know where the term "breaking balls" came from, but after
watching this brutal video, I must assume it was derived from an
unfortunate cricket injury from a time long ago when plastic cups didn't
yet exist.
Here's the Pain Train coming,Toot Toot:

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New Zealand cricket player Kane Williamson nearly received a free castration
from an errant ball in his match against South Africa. The 86-mph throw
nailed Williamson right in the balls so violently that it even
cracked his cup. The squeamish trauma caused him to hold his most
intimate of areas as he winced in pain and play was suspended.



South African cricketer Dale Steyn was responsible for the cup-breaking
ball, but didn't seem the least bit contrite for his dangerous throw.
He told the injured Williamson, "It looked like it hurt, but I'm not
apologizing." Talk about adding insult to crotch-grabbing injury.



I love that the announcers have a lengthy conversation about the
physics of how the shattering of an athletic supporter cup disperses the
energy from the ball. The discussion is cut short when one of the
announcers brings up the point that Williamson was lucky that his
testicle flesh was not pinched in the snapped plastic. The discourse did
not have a happy ending, but thankfully Williamson returned to the
match with a new cup and an octave higher signing voice.
Since this video, the Cricket player has since gone on to a successful career as a Soprano singer.