The St. Petersburg Open was a professional men's tennis tournament played on indoor hard courts. It was part of the ATP Tour 250 series of the Association of Tennis Professionals (ATP) Tour. The tournament was held annually at the Petersburg Sports and Concert Complex in Saint Petersburg, Russia, since 1995. The tournament takes place in mid to late September, following the conclusion of the US Open. The singles competition features 28 male competitors, while the doubles one features 16 duo teams. The competition has a total prize money pool of $1,180,000 USD.