Where does this come from, and can I check it?

It first appeared at the US Open and settled a set level at 6-6. The figure is taken from International Tennis Federation, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a sports fact?

Yes. It sits on the Sports shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

The tiebreak was introduced in 1970

It first appeared at the US Open and settled a set level at 6-6 Jimmy Van Alen devised the sudden-death finish to stop sets running indefinitely, and the US Open used it first in 1970. Wimbledon adopted a tiebreak in 1971, though its final set stayed long until a 12-12 tiebreak arrived in 2019. All four Slams now use a 10-point tiebreak at 6-6 in the final set. It sits in Mondo's sports collection, one of 200 facts that each trace back to the reference below.

Where this comes from

International Tennis Federation

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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Sports trivia

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Tags: tennis, tiebreak, rules

The tiebreak was introduced in 1970: the short answers

Where does this come from, and can I check it?: It first appeared at the US Open and settled a set level at 6-6. The figure is taken from International Tennis Federation, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a sports fact?: Yes. It sits on the Sports shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.