Specialist sports vocabulary is difficult for outsiders and these meanings are not necessarily to be found in dictionaries, so I think the use of the terms ‘find’ and ‘break’ justifies an answer.
This is used here to mean ‘reach’ in the sense of “Arrive at; get as far as”, but with the unspoken implication that it is the ball that one player has kicked that is reaching the other player, and that the other player has sucessfully received and controlled it.
It is quite difficult to find this meaning in dictionaries. Chambers online doesn’t really gives this meaning in its example but my Chambers iPhone has meaning 8 of 8 as:
To manage to reach, hit, land on, etc.
The nearest the Oxford Dictionary online has is:
3.2 (of a letter) reach (someone).
As well as a ball ‘finding’ a player in sports, it can also find an object, e.g.
“Halfpenny found touch.”
Leigh Halfpenny — a Welsh rugby player — managed to kick the ball over the touch line.
“Griffiths found the net.”
Leigh Griffiths — a Scottish football player — scored a goal. (The goal in professional Association Football generally has a net behind it.)
This is used here in the sense of ‘breakaway’. Actually the Oxford Dictionary online does list an example of this meaning of break:
- (chiefly of an attacking player or team, or of a military force) make a rush or dash in a particular direction.
‘Mitchell won possession and broke quickly, allowing Hughes to score’
It generally occurs when a team that has been defending under pressure is suddenly able to break out and attack under conditions where the opposing team has few players remaining in defense.
Off the post!: is different in kind, as it is just a contraction of a sentence such as
“The ball hit the goal post, but unfortunately did not deflect into the net for a goal, but back into the field of play (or out of play, behind the goal line).”
The context indicates that a goal was not scored, although without this context it would be unclear whether or not the ball deflected into the net for a goal.