William Biggar was born in Mexborough on 16th October, 1874. He played local football for Birtley before joining Sheffield United in 1899. A goalkeeper, he was kept out of the first team by the English international, William Foulke. The team also included some other great players such as Ernest Needham, Walter Bennett, William Barnes and Jack Hedley.
William Foulke was in great form in the 1899-1900 season and once again Sheffield United had the best defensive record in the league. However, in his only game that season, Bigger let in four goals against Nottingham Forest. The club finished in second place to Aston Villa.
The following season Bigger returned to the first-team after William Foulke was injured. This time he did much better and in his first game he took part in his club's 5-0 victory over Manchester City.
In 1901, after playing only 14 games for Sheffield United, Bigger moved to West Ham United. The club also signed Fred Griffiths that year. It was Biggar who started off the season in goal. However, on 27th September, West Ham lost 5-1 to Wellingborough Town. As a result, Griffiths replaced Biggar, as the club's first-team keeper.
William Bigger died in 1935.