O jogador conhece o adversário.

In Portuguese, conhecer is used for knowing a person, place, or thing through familiarity or acquaintance.

So in O jogador conhece o adversário, conhece means the player knows / is familiar with the opponent.

By contrast, saber is usually used for knowing facts, information, or how to do something:

• Ela sabe a resposta. = She knows the answer.
• Eu sei nadar. = I know how to swim.

So you would not normally say O jogador sabe o adversário in this context.

Both jogador and adversário are masculine singular nouns, so they take the masculine singular definite article o:

• o jogador = the player
• o adversário = the opponent

Portuguese uses definite articles more often than English does, so seeing o before both nouns is completely normal.

Here it means knows or is acquainted with.

The verb conhecer can sometimes be translated as to meet in the sense of to get to know / to become acquainted with, depending on context:

• Prazer em conhecer você. = Nice to meet you.

But in O jogador conhece o adversário, it normally means the player knows the opponent.

Conhece is the third-person singular present tense form of conhecer.

Full present-tense conjugation:

• eu conheço
• você / ele / ela conhece
• nós conhecemos
• vocês / eles / elas conhecem

In this sentence, o jogador is a third-person singular subject, so conhece is the correct form.

Portuguese often leaves out subject pronouns when the subject is already clear.

Here, the subject is explicitly stated as o jogador, so adding ele would be unnecessary:

• O jogador conhece o adversário. = natural
• Ele conhece o adversário. = He knows the opponent.
• O jogador ele conhece o adversário. = generally not natural in standard usage

Portuguese does use subject pronouns, but not as constantly as English does.

Yes, but the basic and most neutral order is:

Subject + verb + object
O jogador conhece o adversário.

That is the most straightforward version.

Other orders are possible for emphasis or in special contexts, but they may sound less neutral:

• O adversário, o jogador conhece. = The opponent, the player knows.
• Conhece o adversário. = (He/She/You) knows the opponent.
  This would need context, since the subject is omitted.

So for learners, the original word order is the best default pattern.

Jogador is the masculine form, and jogadora is the feminine form.

• o jogador = the male player / the player
• a jogadora = the female player

Likewise, the article changes with gender:

• o for masculine singular
• a for feminine singular

So if the subject were female, the sentence would be:

• A jogadora conhece o adversário.

If the opponent were female, you would say:

• O jogador conhece a adversária.

The accent in adversário shows the stressed syllable:

ad-ver-SÁ-rio

Without getting too deep into spelling rules, the accent helps mark the correct pronunciation and stress.

This is important because stress placement matters in Portuguese. The accent is not optional; it is part of the correct spelling.

A rough pronunciation guide for an English speaker is:

oo zho-ga-DOR ko-NYESS-ee oo ad-ver-SA-ryoo

A few useful notes:

• j in jogador sounds like the s in measure
• nh in conhece sounds like ny in canyon
• final o in Brazilian Portuguese often sounds like oo
• the stressed syllables are:
  • jogaDOR
  • coNHEce
  • adversÁrio

This is only an approximation, but it can help you get started.

Usually in this sentence, yes, it refers to an opposing player, team, or rival, depending on context.

But adversário can also be used more generally for opponent, rival, or even adversary in a broader sense. In sports, it commonly means the opposing side.

So the exact nuance depends on context, but grammatically it works the same way.

Not by itself.

Conhece tells us that the player knows or is familiar with the opponent, but it does not automatically mean knows well.

If you wanted to add that idea, you could say:

• O jogador conhece bem o adversário. = The player knows the opponent well.

So the original sentence is neutral and does not specify how well the player knows the opponent.

Normally, in this sentence, no.

• O jogador conhece o adversário. = natural
• Jogador conhece adversário. = sounds unnatural as a normal sentence

Portuguese usually needs the articles here when talking about specific nouns in a complete sentence. Dropping them might happen in headlines, notes, or very telegraphic styles, but not in ordinary speech or standard writing.