Answer: onserve

AnswerCrossword Clue
ONSERVE

With no court breaks

ONSERVE

Like a tennis match without breaks

ONSERVE

Like a tennis set with no breaks

ONSERVE
With no breaks, say
ONSERVE
Not down a break, in tennis
ONSERVEEven or close to even, in a tennis set
ONSERVELike a tennis match without a break?
ONSERVEAbout even, in tennis