Answer: backstops

AnswerCrossword Clue
BACKSTOPSTennis and baseball necessities.
BACKSTOPSScreens in sports arenas.
backstopsA catcher
backstopsA person or thing placed at the rear of or behind something as a barrier, support, or reinforcement
backstopsAn emergency precaution or last resort
backstopsA high fence or similar structure behind the home plate area
backstopsBACKSTOP, to bolster (to support (to hold up))