American Express is scoring an ace with this year’s US Open with lots of new goodies for cardholders and a new advertising campaign that leverages the “Official Card” status AmEx holds with the major tennis event. AmEx is also beefing up a special Web site to deliver player news and photos, updated scores and highlights, neat games, and other stuff. AmEx will also present to cardholders on Labor Day a complimentary preloaded one-ride Metrocard and a US Open carrying case featuring an image of one of the tennis greats from the AmEx campaign. AmEx is also offering cardholders “Pose with the Pros”, an interactive photo experience which allows fans to pose next to an image of one of the featured talent in the campaign.cThe Grand Slam at Grand Central put on by Tennis Magazine will feature two tennis courts in Vanderbilt Hall on Friday, Aug. 23. American Express will sponsor appearances by Blake and Roddick and a children’s tennis clinic run by Blake who will also be on hand to meet fans from 7 a.m. to 9 a.m. There will also be an online sweepstakes of the “Ball Blitz” that runs from August 23-26 and will feature its own designated web page at www.tennisanyone.org, where fans can register to win select tickets, including courtside seats to the men’s final, as well as autographed posters and postcards from stars such as Capriati, Sampras and Roddick. For more details: www.usopen.org/americanexpress.