LONDON: Mikel Arteta said Friday that Arsenal’s set-piece prowess has been a decade in the making. The Gunners have scored 10 goals via set pieces in the Premier League this season — the earliest into a campaign any side has reached double figures for such goals in the history of the competition. Arteta finished his playing career at the Emirates in 2016 before he joined Pep Guardiola’s coaching team at Manchester City.