LONDON, March 22 : Eight years ago, Pep Guardiola began one of the most dominant periods by any manager in the history of English football by masterminding a defeat of Arsenal in the League Cup final. On Sunday he repeated the trick at Wembley to remind everyone that despite suggestions his powers are on the wane, he remains the master at delivering silverware. City's 2-0 defeat of Premier League leaders Arsenal courtesy of a double by youngster Nico O'Reilly was Guardiola's 16th major trophy