India, Aug. 16 -- Arsenal delivered an emphatic early warning to their Premier League rivals as Mikel Arteta's champions swept Manchester City aside 3-0 in the Community Shield, handing Enzo Maresca a chastening start to life after Pep Guardiola.

Riccardo Calafiori struck after just 24 seconds at the Principality Stadium in Cardiff before Kai Havertz doubled Arsenal's advantage in the 28th minute. Captain Martin Odegaard then added a superb third immediately after the interval to ensure the first trophy of the English season belonged to Arsenal.

For City, however, the result carried significance beyond the loss of a piece of silverware. Their first competitive game since Guardiola ended his extraordinary decade in Manchester provided an...