NEW YORK (Reuters) - With the old names missing, new faces have taken the spotlight at the U.S. Open as fearless teenagers and hungry qualifiers leave their mark on the year's final Grand Slam.

Injuries have kept the usual headline acts of Roger Federer, Rafa Nadal and Serena Williams off the New York stage this year leaving it to a group of ambitious grinders and newcomers who have had Flushing Meadows buzzing.