Jay Rodriguez secured a 1-0 victory for bottom club West Bromwich Albion at Manchester United, which has confirmed Manchester City as 2017/18 Premier League champions.
The striker latched on to a miscued attempted clearance by Nemanja Matic to fire past David De Gea in the 73rd minute at Old Trafford.
The result puts Man City 16 points clear of Man Utd with five matches remaining, meaning Pep Guardiola's side are impossible to catch.
It was reward for an impressive first win for caretaker West Brom manager Darren Moore, who saw Jake Livermore's effort denied by De Gea in the first half.
West Brom goalkeeper Ben Foster denied Juan Mata in the first period before brilliantly stopping Romelu Lukaku's header as the visitors handled United's second-half pressure.
The Baggies remain in 20th position, but move to within nine points of safety with four matches remaining. Man Utd are one point clear of Liverpool in second place.
See: Man Utd report | West Brom report
Next fixtures
Man Utd: 18 Apr v AFC Bournemouth (A)
West Brom: 21 Apr v Liverpool (H)