Playing cards during a tennis match? (6)

I believe the answer is:

deuces

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'playing cards' is the definition.
(deuce is a kind of playing card)

I cannot understand how the remainder of the clue works.

(Other definitions for deuces that I've seen before include "Ties in tennis and twos in cards" , "Twos in playing cards" .)

I've seen this clue in the Evening Standard.

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