Venue: Flushing Meadows, New York Date: 31 August - 13 September
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Roddick is hoping to win his second US Open title next month
World number five Andy Roddick has described attempts at the US Open to regulate players' updates on social networking site Twitter as "lame".
Signs posted around the USTA National Tennis Center read: "Important. Player Notice. Twitter Warning."
The Tennis Integrity Unit warns that Twitter messages could violate anti-corruption rules, and that tweeting is not allowed on court during matches.
First-round action gets under way at Flushing Meadows, New York, on Monday.
"I think it's lame the US Open is trying to regulate our tweeting," Roddick posted on his own Twitter page. "I understand the on-court issue but not sure they can tell us if we can or can't do it on our own time.... we'll see.
"I definitely respect the rule about inside info and on court, but you would seriously have to be a moron to send 'inside info' through a tweet. Not very subtle/smart .... come on."
Told of Roddick's comments, tournament spokesman Chris Widmaier said: "We agree with Mr Roddick that it would be 'moronic' to provide what might be construed as insider information. However, in the age of new media, it is imperative to ensure the absolute integrity of the game."
The signs are posted in the players' lounge, locker rooms and referee's office, and read: "Many of you will have Twitter accounts in order for your fans to follow you and to become more engaged in you and the sport - and this is great.
"However popular it is, it is important to warn you of some of the dangers posted by Twittering as it relates to the Tennis Anti-Corruption Program Rules."
They add that sending "certain sensitive information concerning your match or other matches and/or players should be avoided. Depending on the information sent out this could be determined as the passing of 'inside information.'"
This is defined as "information about the likely participation or likely performance of a player in an event or concerning the weather, court conditions, status, outcome or any other aspect of an event which is known by a Covered Person and is not information in the public domain."