NEW YORK (Reuters) – The U.S. Open will host a tournament-long campaign to raise awareness and humanitarian aid for Ukraine, the United States Tennis Association (USTA) said on Wednesday, with a goal of raising $2 million in relief. The effort will kick off August 24 with an exhibition event at Louis Armstrong Stadium in New York, with 22-times Grand Slam winner Rafa Nadal, world number one Iga Swiatek and John McEnroe among the headliners. Ticket sales will go toward assisting impacted communities in Ukraine. “This is a vitally important cause, and I’m proud of the way in which our sport has …