Questions & Answers about Dvouhra není čtyřhra.
In Czech, dvouhra and čtyřhra are singular nouns. They name the type of match or event:
- dvouhra = singles
- čtyřhra = doubles
So Czech treats them more like a singles match and a doubles match, or the singles event and the doubles event, rather than using plural forms the way English does.
That is why the verb is also singular: není = is not.
They are compound words built around hra, which means game or play.
- dvouhra = literally something like two-person game/match
- čtyřhra = literally something like four-person game/match
In actual usage, they mean:
- dvouhra = singles
- čtyřhra = doubles
So the sentence is contrasting two different match formats.