With the souvenir ball from his 400th save nestled gently in the pocket of his mitt, Mariano Rivera got a warm hug from a grateful Joe Torre and flashed his proudest smile. The closer by which all closers will soon be judged, Rivera waved to a few fans and disappeared into the dugout, another victory safely secured for the Yankees. And he had an important phone call coming -- owner George Steinbrenner was on the line to offer congratulations.