Félix Mantilla defeated Roger Federer in the final, 7–5, 6–2, 7–6(10–8) to win the men's singles tennis title at the 2003 Italian Open.

Men's singles
2003 Italian Open
Final
ChampionSpain Félix Mantilla
Runner-upSwitzerland Roger Federer
Score7–5, 6–2, 7–6(10–8)
Details
Seeds16
Events
Singles men women
Doubles men women
← 2002 · Italian Open · 2004 →

Andre Agassi was the defending champion, but lost in the first round to David Ferrer.

Seeds

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A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.

  1.   Andre Agassi (first round)
  2.   Juan Carlos Ferrero (semifinals, retired due to a shoulder injury)
  3.   Carlos Moyá (third round)
  4.   Roger Federer (final)
  5.   Andy Roddick (second round)
  6.   Marat Safin (withdrew due to a left wrist injury)
  7.   Albert Costa (third round)
  8.   Jiří Novák (third round)
  9.   Paradorn Srichaphan (first round)
  10.   Sjeng Schalken (first round)
  11.   David Nalbandian (first round)
  12.   Rainer Schüttler (quarterfinals)
  13.   Sébastien Grosjean (first round)
  14.   Gustavo Kuerten (first round)
  15.   Guillermo Coria (third round)
  16.   Younes El Aynaoui (first round)

Draw

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Finals

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Quarterfinals Semifinals Final
                 
    Ivan Ljubičić 6 3 4
    Félix Mantilla 3 6 6
    Félix Mantilla 4 77 6
    Yevgeny Kafelnikov 6 63 4
  Yevgeny Kafelnikov 6 7
Q   Martin Verkerk 3 5
    Félix Mantilla 7 6 710    
4   Roger Federer 5 2 68    
WC   Filippo Volandri 3 7 2
4   Roger Federer 6 5 6
4   Roger Federer 6 4  
2   Juan Carlos Ferrero 2 2r
12   Rainer Schüttler 4 4
2   Juan Carlos Ferrero 6 6

Top half

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Section 1

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First round Second round Third round Quarterfinals
1   A Agassi 6 63 4
    D Ferrer 0 77 6     D Ferrer 2 3  
    I Ljubičić 6 6       I Ljubičić 6 6  
    X Malisse 2 4       I Ljubičić 6 6  
Q   V Hănescu 77 6   15   G Coria 4 3  
    M Youzhny 61 3   Q   V Hănescu 1 66  
    T Henman 2 1   15   G Coria 6 78  
15   G Coria 6 6       I Ljubičić 6 3 4
11   D Nalbandian 3 6 0     F Mantilla 3 6 6
    F Mantilla 6 1 6     F Mantilla 6 6  
    M Fish 7 7       M Fish 4 3  
    F Santoro 5 5       F Mantilla 7 4 6
WC   D Sanguinetti 1 3   7   A Costa 5 6 1
    A Clément 6 6       A Clément 77 2 4
Q   Ž Krajan 4 5   7   A Costa 63 6 6
7   A Costa 6 7  

Section 2

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First round Second round Third round Quarterfinals
3   C Moyá 6 6  
    F Vicente 2 4   3   C Moyá 6 6  
    N Lapentti 6 63 3     M Mirnyi 4 4  
    M Mirnyi 4 77 6 3   C Moyá 4 64  
    B Vahaly 5 6 3     Y Kafelnikov 6 77  
WC   G Galimberti 7 4 6 WC   G Galimberti 5 1  
    Y Kafelnikov 6 1 6     Y Kafelnikov 7 6  
16   Y El Aynaoui 1 6 4     Y Kafelnikov 6 7  
9   P Srichaphan 1 2   Q   M Verkerk 3 5  
    J Nieminen 6 6       J Nieminen 7 4 6
    N Davydenko 2 6 7     N Davydenko 5 6 1
    K Kučera 6 1 5     J Nieminen 0 3  
Q   M Verkerk 6 77   Q   M Verkerk 6 6  
    V Spadea 3 62   Q   M Verkerk 66 6 6
WC   A Gaudenzi 2 3   5   A Roddick 78 3 4
5   A Roddick 6 6  

Bottom half

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Section 3

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First round Second round Third round Quarterfinals
LL   N Massú 6 2 1
WC   F Volandri 1 6 6 WC   F Volandri 6 7  
    R Sluiter 6 4 6     R Sluiter 1 5  
    J-M Gambill 4 6 2 WC   F Volandri 6 6  
    R Štěpánek 6 1 6     R Štěpánek 3 4  
    J Blake 2 6 3     R Štěpánek 6 6  
Q   A Martín 2 6 6 Q   A Martín 4 3  
10   S Schalken 6 3 1 WC   F Volandri 3 7 2
13   S Grosjean 77 4 3 4   R Federer 6 5 6
    T Robredo 64 6 6     T Robredo 6 6  
    J I Chela 6 6       J I Chela 2 0  
    O Rochus 1 1       T Robredo 1 1  
    M Zabaleta 6 6   4   R Federer 6 6  
    D Sánchez 4 2       M Zabaleta 64 2  
    P-H Mathieu 3 5   4   R Federer 77 6  
4   R Federer 6 7  

Section 4

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First round Second round Third round Quarterfinals
8   J Novák 6 6  
    W Arthurs 3 3   8   J Novák 6 6  
    D Hrbatý 6 6       D Hrbatý 1 4  
Q   T Enqvist 3 3   8   J Novák 4 62  
    W Ferreira 3 6 6 12   R Schüttler 6 77  
    F López 6 4 3     W Ferreira 64 2  
Q   M Norman 67 5   12   R Schüttler 77 6  
12   R Schüttler 79 7   12   R Schüttler 4 4  
14   G Kuerten 3 6 4 2   J C Ferrero 6 6  
    G Gaudio 6 2 6     G Gaudio 6 6  
    A Calleri 6 6       A Calleri 4 2  
    S Koubek 2 2       G Gaudio 7 0 2
Q   A Portas 6 2 2 2   J C Ferrero 5 6 6
    À Corretja 3 6 6     À Corretja 4 4  
Q   M Philippoussis 63 4   2   J C Ferrero 6 6  
2   J C Ferrero 77 6  
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