keywords: roddick serena fastball swinging aces
text: Roddick, Serena serve notice: Aces aiming for another US Open &lt;b&gt;...&lt;/b&gt; _ Serena Williams left her opponent swinging at shadows, then Andy Roddick finished off his work with a 135 mph fastball. Roddick and Williams easily aced their latest tests in the US Open on 