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Prepositions after adjectives

Unbeaten in vs unbeaten on

Use unbeaten in for competitions, seasons, or categories. Use unbeaten on mainly for surfaces, grounds, or platforms.

Quick answer

Which preposition follows unbeaten?

Use unbeaten in when referring to a competition, league, or period. Use unbeaten on when referring to a surface, court, or home ground.

The team remained unbeaten in the league.
She is still unbeaten on clay.
They finished the season unbeaten in all away matches.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
unbeaten in + competition/period

Talking about results in events or timeframes

Use unbeaten in with leagues, tournaments, seasons, and sets of matches.

The club stayed unbeaten in the tournament.
He was unbeaten in ten straight fights.
2
unbeaten on + surface/location

Talking about courts, tracks, or venues

Use unbeaten on with playing surfaces or locations where no defeats occurred.

The champion is unbeaten on grass this year.
They remained unbeaten on their home court.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
unbeaten in
The side is unbeaten in Europe this season.
no losses in a competition or context
unbeaten on
She is unbeaten on hard courts.
no losses on a particular surface or venue
unbeaten at
The team is unbeaten at home.
common alternative for locations
beat in
They were beaten in the final.
opposite result within a competition

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using on for competitions

Use in for leagues, tournaments, and seasons.

✕ The club is unbeaten on the league. ✓ The club is unbeaten in the league.

Using in for surfaces

Use on with surfaces such as clay or grass.

✕ She is unbeaten in clay. ✓ She is unbeaten on clay.

Confusing location patterns

At is often more natural for venues like home or stadiums.

✓ The team is unbeaten at home.

Quick practice

Choose the expression that matches the intended meaning.

1. The boxer remained unbeaten ___ the championship.
2. She is unbeaten ___ grass courts this season.
3. The club is unbeaten ___ home.

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Frequently asked questions

Can unbeaten describe people and teams?

Yes. It is common with athletes, teams, and records.

Is unbeaten on the league correct?

No. Use unbeaten in the league.

Can I say unbeaten at home?

Yes. This is a very common expression for sports venues.

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