| Men's singles | |
|---|---|
| 2001 AIG Japan Open Tennis Championships | |
| Champion |  Lleyton Hewitt |
| Runner-up |  Michel Kratochvil |
| Score | 6–4, 6–2 |
| Draw | 56 (7 Q / 5 WC ) |
| Seeds | 16 |
Sjeng Schalken was the defending champion but lost in the quarterfinals to Michel Kratochvil.
Lleyton Hewitt won in the final 6–4, 6–2 against Kratochvil. With the victory, Hewitt became the last male player to win his debut event as a Grand Slam champion (having recently won the US Open) until Jannik Sinner in 2024. [1]
The top eight seeds received a bye to the second round.
Lleyton Hewitt (champion)
Sjeng Schalken (quarterfinals)
Rainer Schüttler (third round)
Jonas Björkman (third round) Michel Kratochvil (final)
Michael Chang (third round)
Marcelo Ríos (quarterfinals)
Francisco Clavet (quarterfinals) Lars Burgsmüller (third round)
Harel Levy (second round) Nicolás Massú (third round) Andrew Ilie (first round) Álex Calatrava (first round) Wayne Arthurs (second round) Michael Russell (third round)
Ramón Delgado (second round)| Semifinals | Final | ||||||||||||
| 1 | Lleyton Hewitt | 6 | 6 | ||||||||||
| James Blake | 4 | 0 | |||||||||||
| 1 | Lleyton Hewitt | 6 | 6 | ||||||||||
| 5 | Michel Kratochvil | 4 | 2 | ||||||||||
 Karol Kučera | 0 | 3 | |||||||||||
| 5 | Michel Kratochvil | 6 | 6 | ||||||||||
| First round | Second round | Third round | Quarterfinals | ||||||||||||||||||||||||
| 1 | L Hewitt | 6 | 6 | ||||||||||||||||||||||||
 J Delgado | 4 | 4 | M-K Goellner | 2 | 2 | ||||||||||||||||||||||
| M-K Goellner | 6 | 6 | 1 | L Hewitt | 6 | 6 | |||||||||||||||||||||
| Q | J Thomas | 3 | 2 | 15 | M Russell | 1 | 1 | ||||||||||||||||||||
| C Mamiit | 6 | 6 | C Mamiit | 6 | 4 | 3 | |||||||||||||||||||||
 N Godwin | 4 | 61 | 15 | M Russell | 3 | 6 | 6 | ||||||||||||||||||||
| 15 | M Russell | 6 | 77 | 1 | L Hewitt | 4 | 6 | 6 | |||||||||||||||||||
| 11 | N Massú | 6 | 6 | 8 | F Clavet | 6 | 4 | 2 | |||||||||||||||||||
| E Kempes | 4 | 4 | 11 | N Massú | 6 | 77 | |||||||||||||||||||||
 Y-I Yoon | 3 | 1 |  T Zíb | 3 | 64 | ||||||||||||||||||||||
| T Zíb | 6 | 6 | 11 | N Massú | 3 | 4 | |||||||||||||||||||||
 N Thomann | 3 | 1 | 8 | F Clavet | 6 | 6 | |||||||||||||||||||||
| T Behrend | 6 | 6 | T Behrend | 67 | 2 | ||||||||||||||||||||||
| 8 | F Clavet | 79 | 6 | ||||||||||||||||||||||||
| First round | Second round | Third round | Quarterfinals | ||||||||||||||||||||||||
| 4 | J Björkman | 6 | 6 | ||||||||||||||||||||||||
| Q |  M Onoda | 4 | 4 | WC | H Kondo | 1 | 3 | ||||||||||||||||||||
| WC | H Kondo | 6 | 6 | 4 | J Björkman | 1 | 5 | ||||||||||||||||||||
| J Blake | 6 | 6 | J Blake | 6 | 7 | ||||||||||||||||||||||
| WC | Y Ishii | 3 | 4 | J Blake | 77 | 7 | |||||||||||||||||||||
| Q | R Žitko | 2 | 77 | 1 | 14 | W Arthurs | 64 | 5 | |||||||||||||||||||
| 14 | W Arthurs | 6 | 63 | 6 | J Blake | 4 | 6 | 6 | |||||||||||||||||||
| 10 | H Levy | 6 | 6 | 7 | M Ríos | 6 | 4 | 1 | |||||||||||||||||||
| Q | S Iwabuchi | 3 | 3 | 10 | H Levy | 5 | 0 | ||||||||||||||||||||
| Q |  D Udomchoke | 6 | 4 | 6 | Q | D Udomchoke | 7 | 6 | |||||||||||||||||||
| B Cowan | 2 | 6 | 3 | Q | D Udomchoke | 3 | 2 | ||||||||||||||||||||
 B Black | 6 | 6 | 7 | M Ríos | 6 | 6 | |||||||||||||||||||||
| E Taino | 4 | 1 | B Black | 2 | 5 | ||||||||||||||||||||||
| 7 | M Ríos | 6 | 7 | ||||||||||||||||||||||||
| First round | Second round | Third round | Quarterfinals | ||||||||||||||||||||||||
| 6 | M Chang | 6 | 6 | ||||||||||||||||||||||||
| A Pretzsch | 63 | 77 | 6 | A Pretzsch | 3 | 4 | |||||||||||||||||||||
| P Srichaphan | 77 | 65 | 1 | 6 | M Chang | 63 | 2 | ||||||||||||||||||||
 S Sargsian | 6 | 6 | WC | T Suzuki | 77 | 6 | |||||||||||||||||||||
 A Sá | 2 | 3 | S Sargsian | 5 | 6 | 4 | |||||||||||||||||||||
| WC | T Suzuki | 5 | 6 | 6 | WC | T Suzuki | 7 | 4 | 6 | ||||||||||||||||||
| 12 | A Ilie | 7 | 2 | 4 | WC | T Suzuki | 3 | 3 | |||||||||||||||||||
| 16 | R Delgado | 6 | 6 | K Kučera | 6 | 6 | |||||||||||||||||||||
| WC | G Motomura | 4 | 4 | 16 | R Delgado | 4 | 4 | ||||||||||||||||||||
| K Kučera | 6 | 4 | 6 | K Kučera | 6 | 6 | |||||||||||||||||||||
| A Simoni | 3 | 6 | 1 | K Kučera | 6 | 6 | |||||||||||||||||||||
| M Lee | 4 | 2 | 3 | R Schüttler | 2 | 2 | |||||||||||||||||||||
| M Larsson | 6 | 6 | M Larsson | 3 | 5 | ||||||||||||||||||||||
| 3 | R Schüttler | 6 | 7 | ||||||||||||||||||||||||
| First round | Second round | Third round | Quarterfinals | ||||||||||||||||||||||||
| 5 | M Kratochvil | 77 | 1 | 6 | |||||||||||||||||||||||
| O Fukárek | 6 | 77 | O Fukárek | 63 | 6 | 4 | |||||||||||||||||||||
| Q | D Vacek | 2 | 63 | 5 | M Kratochvil | 6 | 6 | ||||||||||||||||||||
| H-T Lee | 713 | 6 | 9 | L Burgsmüller | 3 | 2 | |||||||||||||||||||||
| M Hantschk | 611 | 4 | H-T Lee | 6 | 3 | 5 | |||||||||||||||||||||
| M Llodra | 63 | 6 | 2 | 9 | L Burgsmüller | 3 | 6 | 7 | |||||||||||||||||||
| 9 | L Burgsmüller | 77 | 2 | 6 | 5 | M Kratochvil | 6 | 6 | |||||||||||||||||||
| 13 | Á Calatrava | 3 | 1 | 2 | S Schalken | 3 | 4 | ||||||||||||||||||||
| I Heuberger | 6 | 6 | I Heuberger | 3 | 6 | 6 | |||||||||||||||||||||
| Q | N Behr | 6 | 6 | Q | N Behr | 6 | 4 | 4 | |||||||||||||||||||
| WC | T Terachi | 2 | 1 | I Heuberger | 2 | 2 | |||||||||||||||||||||
 I Labadze | 77 | 3 | 5 | 2 | S Schalken | 6 | 6 | ||||||||||||||||||||
| C Vinck | 63 | 6 | 7 | C Vinck | 3 | 4 | |||||||||||||||||||||
| 2 | S Schalken | 6 | 6 | ||||||||||||||||||||||||
Roger Federer defeated Marat Safin in the final, 7–6(7–3), 6–4, 6–2 to win the men's singles tennis title at the 2004 Australian Open. It was his first Australian Open title and second major title overall. With the win, Federer gained the world No. 1 ranking for the first time in his career, and would hold the position for a record 237 consecutive weeks.
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