The winners of the 1920 County Championship were Middlesex. They finished the season with 15 wins, 2 losses, and 3 draws, with a 77 percent points percentage (counting 5 points for a win, two points for a drawn match in which they won the first innings, and no points for a draw in which they lost the first innings).
Durham won the 2008 championship
Yorkshire with 30 County Championship titles (plus 1 shared) hold the record
The 1920-21 Italian Football Championship was won by Pro Vercelli.
Be Quick 1887 won the Netherlands League championship in 1920.
Lancashire did this in 1956. That's the only team to have done it.
The 1929 English cricket season featured a tour by the South African team, which England won 2-0. In domestic cricket, Nottinghamshire overcame their two northern rivals, Lancashire and Yorkshire, to win the County Championship.
West Indies
Akron Pros
Thurles Sarsfields won the 2010 Tipperary Senior Hurling Championship.
England won the 2010 T20 world cup.
Crossmaglen have won more county titles than any other club in Ireland. They have won the Armagh county championship 38 times.
The Ranji Trophy is a domestic first-class cricket championship played in India between different city and state sides.