Single-loss elimination

A single-elimination, knockout, or sudden death tournament is a type of elimination tournament where the loser of each match-up is immediately eliminated from winning the tournament. Each winner will play another in the next round, until the final match-up, whose winner becomes tournament champion. Each match-up may be a single match or several, for example two-legged ties in European football or best-of series in American pro sports. Defeated competitors may play no further part after losing, or may participate in "consolation" or "classification" matches against other losers to determine the lower final rankings; for example, a third place playoff between losing semi-finalists. In a shootout poker tournament, there are more than two players competing at each table, and sometimes more than one progressing to the next round. Some competitions are held with a pure single-elimination tournament system. Others have many phases, with the last being a single-elimination final stage, often called playoffs.

In English, the round in which only eight competitors remain is generally called (with or without hyphenation) the quarter-final round; this is followed by the semi-final round, in which only four are left, the two winners of which then meet in the final or championship round.

The round before the quarter-finals has multiple designations. Often it's called the round of sixteen, last sixteen, or (in South Asia) pre-quarter-finals. In many other languages the term used to describe these eight matches translates to eighth-final, though this term is rare in English itself.

Earlier rounds are typically numbered counting forwards from the first round, or by the number of remaining competitors. If some competitors get a bye, the round at which they enter may be named the first round, with the earlier matches called a preliminary round, qualifying round, or the play-in games".

Examples of the names given to rounds in various generic conventions and specific competitions:

4th round (Wimbledon)

Notes:

The final three rounds of the 2014 Australian Open – Women's Singles knock-out tournament:

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