Last Updated：2022/12/23
Sentence
The
men
at
the
U.S.
Open
use
what
is
known
as
an
“extra-duty”
ball,
which
means
the
felt
on
the
outside
of
the
ball
is
woven
slightly
more
loosely
than
the
“regular-duty”
ball
the
women
use.
[…]
Extra-duty
balls
are
the
balls
of
choice
for
outdoor
hardcourts,
like
those
at
the
U.S.
Open,
except
when
they
are
not.
Quizzes for review
The men at the U.S. Open use what is known as an “extra-duty” ball, which means the felt on the outside of the ball is woven slightly more loosely than the “regular-duty” ball the women use. […] Extra-duty balls are the balls of choice for outdoor hardcourts, like those at the U.S. Open, except when they are not.
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