Si la delantera vuelve a marcar, el equipo ganará el campeonato.

Because delantera is the feminine form of delantero, which in football means a forward or striker. Since the sentence is talking about a female player, Spanish uses the feminine article and noun: la delantera.

In some contexts, la delantera can also mean the forward line or attack, but here it most naturally refers to one female attacking player.

The structure volver a + infinitive means to do something again.

So:

• volver a marcar = to score again
• vuelve a marcar = she scores again / she will score again, depending on context

The a is part of this grammar pattern, so you should not leave it out.

In football Spanish, especially in Spain, marcar is a very common verb meaning to score.

For example:

• marcar un gol = to score a goal
• marcar dos veces = to score twice

Literally, marcar can also mean to mark, but in sports contexts it often means to score. In this sentence, un gol is not stated because it is understood.

Because in Spanish, a real future condition is normally formed with:

• si + present indicative
• then a main clause in the future or another suitable tense

So this pattern is correct:

• Si la delantera vuelve a marcar, el equipo ganará el campeonato.

Not:

• Si la delantera volverá a marcar...

This works much like English:

• If the striker scores again, the team will win the championship.

Because this sentence presents a possible, realistic condition, not an unreal or highly hypothetical one.

With si, Spanish normally uses the indicative for real conditions:

• si vuelve

If you wanted a more hypothetical meaning, you would use the imperfect subjunctive in the si clause and the conditional in the result clause:

• Si la delantera volviera a marcar, el equipo ganaría el campeonato.

That would mean something more like If the striker were to score again, the team would win the championship.

Ganará is the simple future of ganar:

• ganaré = I will win
• ganarás = you will win
• ganará = he/she/it will win

So el equipo ganará means the team will win.

Yes, va a ganar would also be possible in many contexts:

• Si la delantera vuelve a marcar, el equipo va a ganar el campeonato.

Both are natural. Ganará is a little more compact and often sounds slightly more formal or predictive.

Spanish often leaves out subject pronouns because the subject is already clear from the context or from the noun itself.

Here, la delantera is the subject, so adding ella would usually be unnecessary:

• Si la delantera vuelve a marcar...

not usually

• Si ella la delantera vuelve a marcar...

And simply adding ella before the verb would also be redundant unless you wanted emphasis:

• Si ella vuelve a marcar... = If she scores again...

So Spanish prefers to avoid pronouns when they are not needed.

Spanish uses definite articles more often than English does.

Here they are natural because each noun refers to a specific, identifiable thing:

• la delantera = the striker/forward being discussed
• el equipo = the team in question
• el campeonato = the championship/title in question

In English, we sometimes use fewer articles, but in Spanish, leaving them out here would sound unnatural or incomplete.

Yes. That version has the same basic meaning.

Both are correct:

• Si la delantera vuelve a marcar, el equipo ganará el campeonato.
• El equipo ganará el campeonato si la delantera vuelve a marcar.

The main difference is punctuation:

• When the si clause comes first, Spanish normally uses a comma.
• When the main clause comes first, the comma is usually not used.

So the original punctuation is correct.