without the operational roof on centre court and with the old Grandstand in place. Starting from the 2016 edition, the Arthur Ashe Stadium will have completed retractable roof and matches will be played on newly built Grandstand. After two years of tournament being scheduled across 15 days, the US Open returns to a traditional 14-day schedule in 2015, which has impact on all senior events. Women's singles semifinals have been scheduled for September 10 evening session, while men's singles semifinal matches will be played on Friday September 11 after mixed doubles final. Men's doubles final will be played before women's singles final on Saturday September 12, and men's singles final will follow women's doubles final. Because Serena Williams could become the first woman to win all four major tennis titles in a calendar year since Steffi Graf accomplished the feat in 1988 and because she could tie Graf's major title count of 22, the women's final sold out before the men's final for the first time. Broadcast In the United States, the 2015 US Open was the first under a new, 11-year, $825 million contract with ESPN, in which the broadcaster holds exclusive rights to the entire tournament and the US Open Series, thus ending CBS Sports' 46-year association with the tournament, and availability of coverage on broadcast television. This also made ESPN the exclusive U.S. broadcaster for three of the four tennis majors (the French Open is split between Tennis Channel for cable coverage and NBC for over-the-air coverage, with portions previously sub-licensed to ESPN until 2016). Point and prize money distribution Point distribution Below is a series of tables for each of the competitions showing the ranking points on offer for each event. Senior Wheelchair Junior Prize money The US Open total prize money for 2015 was increased by 10.5 percent to a record $42,253,400, which potentially could reach almost 45 million dollars, as the top three finishers in the Emirates Airline US Open Series may earn up an additional $2.625 million in bonus money at the US Open. Of the total prize money, $33,017,800 (plus $1,760,000 in qualifying competitions) is distributed for singles players, $4,927,600 for teams competing in doubles events and $500,000 for mixed doubles teams. Competitors in Legends Exhibition, Wheelchair and Champions Invitational events earn $570,000 while players' per diem is estimated at $1,478,000. Bonus prize money Top three players in the 2015 US Open