Ο οπαδός θέλει νίκη, αλλά η οπαδός λέει ότι το δύο δύο δεν είναι κακό.

Because οπαδός is a noun that can refer to either a male or a female supporter/fan. The noun itself stays the same in the nominative singular, but the article shows the gender:

• ο οπαδός = the male fan/supporter
• η οπαδός = the female fan/supporter

So Greek is using the article to tell you whether the person is male or female.

Because νίκη here is being used in a more general or indefinite sense: wants victory / wants a win.

Greek often leaves out the article when the meaning is not specific. Compare:

• θέλει νίκη = he wants victory / he wants a win
• θέλει τη νίκη = he wants the victory / he wants that specific win

So the version without the article sounds more general and natural in this context.

It is in the accusative singular, because it is the direct object of θέλει.

The structure is:

• Ο οπαδός = subject
• θέλει = verb
• νίκη = direct object

So even though the meaning is already known, grammatically νίκη is the thing being wanted.

Because Greek often drops subject pronouns when they are not needed.

The verb endings already show the person and number:

• θέλει = he/she/it wants
• λέει = he/she/it says

So instead of saying a separate word for he or she, Greek usually just uses the noun or nothing at all if the subject is already clear.

ότι means that and introduces a subordinate clause:

• λέει ότι... = says that...

So the sentence after ότι is the content of what the female fan is saying.

A useful extra note: ότι is different from ό,τι.

• ότι = that
• ό,τι = whatever / anything that

Here it is definitely ότι = that.

In sports language, especially football/soccer, Greek can treat a scoreline like a noun phrase. So το δύο δύο means the 2–2 score / the 2–2 draw.

The article το makes the whole score behave like a neuter noun phrase.

You will often also see it written as:

• το 2-2
• το δύο-δύο

In speech, το δύο δύο sounds natural.

Because it agrees with το δύο δύο, which is treated as a neuter singular expression.

So:

• το δύο δύο = neuter singular subject
• κακό = neuter singular adjective

That is why Greek says:

• το δύο δύο δεν είναι κακό

and not κακή or κακός.

Yes. It works very much like English.

It can mean:

• literally: it is not bad
• pragmatically: it’s acceptable, it’s a decent result, it’s actually okay

In a football context, saying a 2–2 result is not bad suggests that the speaker sees it as a reasonable or acceptable outcome.

Because δύο is a numeral that normally does not change form in Modern Greek.

So whether it is part of a score, counting, or describing quantity, δύο stays δύο.

That is why Greek can simply say:

• δύο δύο

without changing the form of the number.

A simple breakdown is:

• Ο οπαδός = the male fan/supporter
• θέλει = wants
• νίκη = victory / a win
• αλλά = but
• η οπαδός = the female fan/supporter
• λέει = says
• ότι = that
• το δύο δύο = the 2–2 score / the 2–2 draw
• δεν είναι κακό = is not bad

So structurally, it is:

subject + verb + object, but subject + verb + that-clause

This is a very normal Greek sentence pattern.

Yes. Greek word order is more flexible than English word order, because case endings and articles help show what each word is doing.

This sentence uses a very natural, straightforward order. But Greek could move things around for emphasis. For example, if the speaker wanted to emphasize the result, they might put το δύο δύο in a more prominent position.

Still, the version you have is neutral and easy to understand, so it is a good model sentence for a learner.