Crossword Genius

A victor breaks record, winning tennis tournament (5,3)

Ross

I believe the answer is:

davis cup

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

'tennis tournament' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for davis cup that I've seen before include "International tennis tournament" , "International lawn tennis championship" , "event?" , "International tennis team championship" , "Sets competition" .)

I've seen this clue in The Times.
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