Celtic F.C. their sixth successive league title on 2 April 2017, with a record eight league games to spare. As Celtic's unbeaten domestic run continued, they subjected Rangers to their heaviest defeat at Ibrox since 1915, 5–1, on 29 April. Celtic's 2–0 win over Hearts on 21 May saw them finish 30 points ahead of second-placed Aberdeen in the league, with a record 106 points, and the team became the first Scottish side to complete a top-flight season undefeated since Rangers in 1899. On 27 May 2017, Celtic clinched their fourth treble by defeating Aberdeen 2–1 in the Scottish Cup final. The
Scottish Football League XI played in one of the three main stadiums in Glasgow: Hampden Park, Ibrox Park or Celtic Park. Until the fixture declined in importance in the late 1960s, matches against the Football League would regularly attract crowds in excess of 40,000, peaking at 90,000 in 1949. The less attractive matches, against the Irish League XI or the League of Ireland XI, were spread around Scotland more evenly. Grounds in Dundee (Carolina Port and Dens Park), Edinburgh (Easter Road and Tynecastle), Paisley (Love Street) and Motherwell (Fir Park) were used in addition to Glasgow. Smaller stadiums were also used in Glasgow itself,