Amateur wrestling is the most widespread form of sport wrestling. There are two international wrestling styles performed in the Olympic Games under the supervision of FILA (Fédération Internationale des Luttes Associées or International Federation of Associated Wrestling Styles): Greco-Roman and freestyle. Freestyle is possibly derived from the English Lancashire style. A similar style, commonly called collegiate (also known as scholastic or folkstyle), is practiced in colleges and universities, secondary schools, middle schools, and among younger age groups in the United States. Where the style is not specified, this article refers to the international styles played on a mat.
In the international styles, the format is now three two-minute periods. A wrestler wins the match when he has won two out of three periods. For example, if one competitor were to win the first period 1-0 and the second period 1-0, the match would be over. However, if the other competitor were to win the second period, then a third and deciding period would result. Only a fall, injury default, or disqualification terminates the match; all other modes of victory result only in period termination.
In collegiate wrestling, the period structure is different. A college match consists of one three-minute period, followed by two two-minute periods, with an overtime round if necessary. A high school match typically consists of three two-minute periods, with an overtime round if necessary. Under the standard rules for collegiate wrestling, draws are not possible; this rule is sometimes modified for young wrestlers.