<P> From 1984 through 2015, the U.S. Open deviated from traditional scheduling practices for tennis tournaments with a concept that came to be known as "Super Saturday": the men's and women's finals were played on the final Saturday and Sunday of the tournament respectively, and their respective semi-finals were held one day prior . The Women's final was originally held in between the two men's semi-final matches; in 2001, the Women's final was moved to the evening so it could be played on primetime television, citing a major growth in popularity for women's tennis among viewers . This scheduling pattern helped to encourage television viewership, but proved divisive among players because it only gave them less than a day's rest between their semi-finals and championship match . </P> <P> For five consecutive tournaments between 2007 through 2012, the Men's final was postponed to Monday due to weather . In 2013 and 2014, the USTA intentionally scheduled the Men's final on a Monday--a move praised for allowing the Men's players an extra day's rest following the semis, but drew the ire of the ATP for further deviating from the structure of the other Grand Slams . In 2015, the Super Saturday concept was dropped, and the US Open returned to a format similar to the other majors, with Men's and Women's finals on Saturday and Sunday . However, weather delays forced both sets of semifinals to be held on Friday that year . </P> <P> The grounds of the US Open hold a total of 22 courts consisting of four "show courts" (Arthur Ashe, Louis Armstrong, Grandstand and Court 17), 13 field courts and five practice courts . </P> <P> The main court is the 22,547 - seat Arthur Ashe Stadium which opened in 1997 . It is named after Arthur Ashe, the African - American tennis player who won the men's final of the inaugural US Open in 1968 . The next largest court is the Louis Armstrong Stadium, opened in 1978, extensively renovated from the Singer Bowl, which was built for the 1964 New York World's Fair . It was the main stadium from 1978 to 1996 . Its peak capacity neared 18,000 seats, but was reduced to 10,200 by the removal of the upper tiers of seating after the opening of Arthur Ashe Stadium . The third largest court is the 6,000 - seat Grandstand, created when the rectangular Singer Bowl was transformed into the square Armstrong Stadium, leaving about a third of the Bowl available to become another venue . </P>

How many courts does the us open have