NEW YORKThe US Open is investing $600 million (Sh60 billion)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:1968: Arthur Ashe and Virginia Wade win the first-ever US championships to permit both amateurs and professional players. The tournament opts for a hard court with a true bounce, avoiding grass and clay, the surface of choice at the other tennis Grand Slams. 1984: "Super Saturday" goes down as one of the greatest days in tennis history, with Ivan Lendl beating Pat Cash and John McEnroe outlasting Jimmy Connors in men's semi-final matches. 2004: Roger Federer defeats Lleyton Hewitt in the final, an early marker of a men's tennis era with several all-time greats.

Source: Daily Nation August 26, 2016 08:25 UTC