Crossword Genius

Greatly value what happened in a very quick tennis match? (3,5,2)

Ross

I believe the answer is:

set store by

I'm a little stuck... Click here to teach me more about this clue!

'greatly value' is the definition.
'set store by' can be an answer for 'value' (I've seen this in another clue). I'm not certain of the 'greatly' bit.

'happened in a very quick tennis match?' is the wordplay.
I cannot quite see how this works, but
'match?' could be 'set' (matching is a kind of setting) and 'set' is located in the answer.
This explanation may well be incorrect...

'what' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.
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