sentences:  The main court is the 23,771-seat Arthur Ashe Stadium, which opened in 1997.A US$180 million retractable roof was added in 2016.The stadium is named after Arthur Ashe, the African-American who won the men's singles title at the inaugural US Open in 1968, the Australian Open in 1970, and Wimbledon in 1975 and who was inducted into the International Tennis Hall of Fame in 1985.