2009 US Open – Men's Singles

Roger Federer was the defending champion, but was defeated by Juan Martín del Potro in the final, 6–3, 6–7(5), 6–4, 6–7(4), 2–6.
Seeds

 Roger Federer (Final, lost to Juan Martín del Potro)
 Andy Murray (Fourth Round, lost to Marin Čilić)
 Rafael Nadal (Semifinals, lost to Juan Martín del Potro)
 Novak Djokovic (Semifinals, lost to Roger Federer)
 Andy Roddick (Third Round, lost to John Isner)
 Juan Martín del Potro (Champion)
 Jo-Wilfried Tsonga (Fourth Round, lost to Fernando González)
 Nikolay Davydenko (Fourth Round, retired - hip injury - against Robin Söderling)
 Gilles Simon (Third Round, retired - knee injury - against Juan Carlos Ferrero)
 Fernando Verdasco (Quarterfinals, lost to Novak Djokovic)
 Fernando González (Quarterfinals, lost to Rafael Nadal)
 Robin Söderling (Quarterfinals, lost to Roger Federer)
 Gaël Monfils (Fourth Round, lost to Rafael Nadal)
 Tommy Robredo (Fourth Round, lost to Roger Federer)
 Radek Štěpánek (Fourth Round, lost to Novak Djokovic)
 Marin Čilić (Quarterfinals, lost to Juan Martín del Potro)

<li>  Tomáš Berdych (Third Round, lost to Fernando González)
<li>  David Ferrer (Second Round, lost to José Acasuso)
<li>  Stanislas Wawrinka (First Round, lost to Nicolás Lapentti)
<li>  Tommy Haas (Third Round, lost to Fernando Verdasco)
<li>  James Blake (Third Round, lost to Tommy Robredo)
<li>  Sam Querrey (Third Round, lost to Robin Söderling)
<li>  Philipp Kohlschreiber (Third Round, lost to Radek Štěpánek)
<li>  Juan Carlos Ferrero (Fourth Round, lost to Juan Martín del Potro)
<li>  Mardy Fish (Withdrew due to rib injury) 
<li>  Paul-Henri Mathieu (First Round, lost to Mikhail Youzhny)
<li>  Ivo Karlović (First Round, lost to Iván Navarro)
<li>  Victor Hănescu (First Round, lost to John Isner)
<li>  Igor Andreev (First Round, lost to Jesse Witten)
<li>  Viktor Troicki (Second Round, lost to Julien Benneteau)
<li>  Lleyton Hewitt (Third Round, lost to Roger Federer)
<li>  Nicolás Almagro (Third Round, lost to Rafael Nadal)

Draw

Finals

Top Half
Section 1

Section 2

Section 3

Section 4

Bottom Half
Section 5

Section 6

Section 7

Section 8

Other websites
 Official site of US Open

Men's Singles