Originally it was an event of the Grand Prix tennis circuit between 1970 and 1989. Since 2009 it has been part of the World Tour 500 Series of the ATP Tour. Before 2009, it was part of the ATP International Series which in 2009 became the ATP World Tour 250 series. It has been held annually at the St. Jakobshalle in Basel, Switzerland, in October, since 1995.
Roger Federer holds the record for most singles titles, having won the tournament nine times, in 2006–2008, 2010–2011, 2014–2015 and 2017–2018. Federer has reached the final a record fourteen times , which is also an Open Era record for most finals reached at a single ATP event.
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