The U.S. Open is investing US$600 million to upgrade its grounds in Queens where the season's final Grand Slam event gets under way on Monday. Here are other key dates in the history of the tournament:
Serena Williams Seeded: 1 Age: 34 Country: United States
Two-time defending champion Petra Kvitova needed just an hour Thursday to beat Ekaterina Makarova 6-3, 6-1 and move into the semifinals of the Connecticut Open, despite suffering from a cold.
Novak Djokovic Seeded: 1 Age: 29 Country: Serbia
Sam Querrey got off to a successful start at the ATP Winston-Salem tournament by reaching the third round with a 6-3, 6-7 (5/7), 7-5 win over Guillermo Garcia-Lopez.
Top seed Agnieszka Radwanska overcame a slow start and breezed past Jelena Ostapenko 7-5, 6-1 on Tuesday night in the second round of the Connecticut Open.
Caroline Wozniacki entered the Connecticut Open as a wild card, hoping a tournament she has won four times would help her tune up for the U.S. Open.
Serena Williams held onto the number one spot in the WTA world rankings on Monday, after Angelique Kerber slipped to defeat against Karolina Pliskova in the final of the Cincinnati hardcourt tournament.
Angelique Kerber reached the Western & Southern Open final Saturday, leaving her one win away from unseating Serena Williams at No. 1.
Rafael Nadal gave up his ambitious dream of an Olympic golden treble Thursday after spending an exhausting four hours on court to reach the singles quarter-finals and men's doubles final.