The most common and most likely answer to this crossword clue is the 10 letter word INSWINGERS
I've seen this crossword clue in The Daily Telegraph
I
N
S
W
I
N
G
E
R
S
Buddy explains!

The straight part
We know that "Balls delivered" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case balls delivered = inswingers.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does INSWINGERS mean?
INSWINGERS noun- A ball that curves into the goal.
- A delivery that curves towards the batsman.