It counts for nothing on the tennis court (4)

I believe the answer is:

love

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'nothing on the tennis court' is the definition.
'love' can be an answer for 'nothing' (love is zero in tennis). I am not sure about the 'on the tennis court' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for love that I've seen before include "Adoration" , "All you need, according to the song" , "affair? On the contrary" , "See 4" , "angel" .)

I've seen this clue in The Globe and Mail.

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