Con ese gol, el marcador volvió a estar a nuestro favor.

Here con does not mean a literal physical with. In sports commentary, con + noun often means as a result of, thanks to, or with that.

So Con ese gol means something like:

• With that goal
• Thanks to that goal
• As a result of that goal

It sets up the cause for what follows.

Ese usually points to something already mentioned, already known, or mentally a little removed from the speaker.

In this sentence, ese gol refers to that goal—probably one that has just been mentioned in the conversation or commentary.

Very roughly:

• este = this
• ese = that
• aquel = that over there / that one further away

So ese gol is the natural choice for referring back to a specific goal.

In this context, el marcador means the score or the scoreline, not just the physical scoreboard.

Depending on context, marcador can refer to:

• the scoreboard itself
• the score being shown

Here it clearly means the state of the score in the match.

So el marcador volvió a estar a nuestro favor means the score became favourable to us again.

This is the very common structure:

• volver a + infinitive

It means to do something again.

So:

• volvió a estar = was again / became ... again

Literally, it is closer to:

• returned to being

In the sentence, it implies that at some earlier point the score had been in our favour, then it stopped being in our favour, and then after this goal it was in our favour again.

Because volver uses the fixed pattern volver a + infinitive when it means to do again.

Examples:

• Volvió a llamar = He/She called again
• Volvimos a intentarlo = We tried again
• El marcador volvió a estar a nuestro favor = The score was in our favour again

So the a belongs to the grammar of the expression, not to estar by itself.

Estar is used for states or conditions, especially temporary ones. A score in a match is something that can change, so estar is the natural verb.

• estar a nuestro favor = to be in our favour

Using ser here would sound wrong, because the score is not being described as an essential, permanent characteristic.

A favor is part of a fixed expression:

• a favor de alguien = in someone’s favour

So:

• a nuestro favor = in our favour

This is just the standard idiomatic Spanish expression. You learn it as a unit:

• estar a favor de
• jugar a favor de
• fallar a favor de
• estar el marcador a nuestro favor

English uses in, but Spanish uses a in this expression.

Spanish usually prefers a possessive adjective like nuestro rather than de nosotros in cases like this.

So the normal phrase is:

• a nuestro favor = in our favour

Using a favor de nosotros is grammatically possible, but it sounds heavier and less natural here. It might be used only for emphasis or contrast.

Not very naturally in English. Even though marcador can literally mean scoreboard, here it really refers to the score.

More natural English translations would be:

• With that goal, the score was back in our favour.
• With that goal, the scoreline swung back our way.
• Thanks to that goal, we were ahead again. (depending on context)

So learners should understand that marcador often means more than the physical board.

Because Con ese gol is an introductory phrase placed at the front of the sentence.

The comma helps separate that opening context from the main clause:

• Con ese gol, el marcador volvió a estar a nuestro favor.

In shorter sentences, commas after introductory phrases are sometimes optional in Spanish, but here the comma is very natural and helps readability.

Yes, that would be possible in many contexts, but it changes the wording and slightly shifts the focus.

Compare:

• el marcador volvió a estar a nuestro favor
  Focuses on the score being favourable again.

• volvimos a ir ganando
  Focuses more directly on us being in the lead again.

Both could fit a football context, but the original sounds a bit more like neutral sports reporting or commentary.

Yes. It sounds very natural in football or other sports reporting.

Words and phrases like these are especially common in sports language:

• gol
• marcador
• a nuestro favor
• volver a estar

So a learner should recognise this as standard sports/journalistic Spanish, especially common in match summaries or commentary.