The Olympus US Open Series is the six-week summer tennis season linking 10 major ATP and Sony Ericsson WTA Tour tournaments to the US Open. Since its inception in 2004, the Olympus US Open Series has doubled television viewership and increased attendance, while generating new corporate partnerships for the sport. In 2007, the Olympus US Open Series — including the US Open — generated a record 1.7 million attendees, 121 million TV viewers and over 32 million website visits making it the strongest summertime property in sports.
To be included in the standings and subsequently the bonus prize money, a player has to have countable results from two different tournaments. Players finishing in the top three in the series can earn up to $1 million in extra prize money at the US Open . Roger Federer received the largest US Open pay day of $2.4 million in 2007 after capturing the title in both the US Open Series and the US Open championship.