Wikipedia - Omega European Masters
The Omega European Masters is the Swiss stop on professional men's golf's European Tour, and in 2009 it became the first event in Europe to be co-sanctioned by the Asian Tour.
Founded as the Swiss Open in 1923, the tournament was prefixed with European Masters in 1983, before dropping Swiss Open from the title in 1992. During the 1971 event, Baldovino Dassù became the first player to score 60 for 18 holes on the European circuit. The tournament has been held at the Golf-Club Crans-sur-Sierre at Crans-Montana in Valais since 1939, and is currently played in early September each year.