प्रतिद्वंद्वी के रैकेट नए हैं।

के is the possessive postposition here. It links प्रतिद्वंद्वी to रैकेट, so the structure is basically:

प्रतिद्वंद्वी के रैकेट = the opponent’s rackets

In Hindi, possession is often expressed with का / की / के, which change depending on the thing being possessed.

Because के agrees with रैकेट, the possessed noun, not with प्रतिद्वंद्वी.

Here, रैकेट is being treated as masculine plural, so the correct possessive form is के:

• masculine singular → का
• feminine singular → की
• masculine plural → के

So:

• प्रतिद्वंद्वी का रैकेट = the opponent’s racket
• प्रतिद्वंद्वी के रैकेट = the opponent’s rackets

Because they agree with रैकेट, which is plural in this sentence.

• नया = new, masculine singular
• नए = new, masculine plural
• है = is
• हैं = are

So the grammar is showing that the sentence is about multiple rackets, not one racket.

That is very common in Hindi, especially with loanwords and many nouns that do not show a different plural form in the direct case.

Here, रैकेट looks the same in singular and plural, but the other words tell you the number:

• नए = plural
• हैं = plural

So even though रैकेट itself does not visibly change, the sentence clearly means rackets.

It is a borrowed word, from English racket. Hindi uses many loanwords like this, especially for sports, technology, and modern objects.

Its pronunciation in Hindi is roughly raikeṭ.

Even though it comes from English, it still follows Hindi grammar in the sentence.

In a possessive construction like this, the noun before का / की / के is in the oblique form. However, not every noun shows a visible change in the oblique.

प्रतिद्वंद्वी is one of those nouns whose form stays the same here, so you do not see a separate ending.

So grammatically it is in the right form, even though it looks unchanged.

The structure is:

possessor + के + possessed noun + adjective + verb

So:

• प्रतिद्वंद्वी के = the opponent’s
• रैकेट = rackets
• नए = new
• हैं = are

This is a very normal Hindi pattern for sentences like X’s Y are Z.

Not literally. This sentence is more directly The opponent’s rackets are new.

In English, those two ideas are often very close, but in Hindi they are structured differently.

If you want to say The opponent has new rackets, Hindi often uses पास:

प्रतिद्वंद्वी के पास नए रैकेट हैं।

That is the more direct has structure.

Not necessarily in everyday meaning. It means opponent / rival, and it can refer to a person of either gender depending on context.

In this sentence, that does not affect के, नए, or हैं, because those are agreeing with रैकेट, not with the opponent.

It is usually pronounced roughly na-ye.

So the sentence sounds approximately like:

pratidvandvī ke raikeṭ na-ye hain

Learners sometimes want to pronounce नए as one syllable, but it is better thought of as two parts: na + ye.

In a full normal sentence, हैं should be included.

Hindi often needs the correct form of to be in this kind of statement:

• रैकेट नया है = the racket is new
• रैकेट नए हैं = the rackets are new

You may sometimes see the verb omitted in headlines, notes, or very informal styles, but standard complete Hindi keeps हैं here.