| Singles | |
|---|---|
| 2005 Grand Prix Hassan II | |
| Champion |  Mariano Puerta |
| Runner-up | Juan Mónaco |
| Final score | 6–4, 6–1 |
Santiago Ventura was the defending champion, but lost in the second round.
Mariano Puerta won the title, defeating Juan Mónaco 6–4, 6–1 in the final.
Rainer Schüttler (first round)
Filippo Volandri (semifinals)
Luis Horna (first round)
Fabrice Santoro (first round) Florian Mayer (second round) Mariano Puerta (champion)
Gilles Müller (quarterfinals)
Christophe Rochus (quarterfinals)| Semifinals | Final | ||||||||||||
 Tomáš Zíb | 2 | 4 | |||||||||||
| Juan Mónaco | 6 | 6 | |||||||||||
| Juan Mónaco | 4 | 1 | |||||||||||
| 6 | Mariano Puerta | 6 | 6 | ||||||||||
| 6 | Mariano Puerta | 6 | 78 | ||||||||||
| 2 | Filippo Volandri | 3 | 66 | ||||||||||
| First round | Second round | Quarter-finals | Semi-finals | ||||||||||||||||||||||||
| 1 | R Schüttler | 2 | 2 | ||||||||||||||||||||||||
| T Zíb | 6 | 6 | T Zíb | 6 | 6 | ||||||||||||||||||||||
 S Ventura | 7 | 6 | S Ventura | 4 | 1 | ||||||||||||||||||||||
| WC |  H Arazi | 5 | 3 | T Zíb | 6 | 79 | |||||||||||||||||||||
| Q | T Ascione | 5 | 4 | 8 | C Rochus | 1 | 67 | ||||||||||||||||||||
| D Sánchez | 7 | 6 | D Sánchez | 5 | 6 | 3 | |||||||||||||||||||||
| WC | M Tahiri | 3 | 2 | 8 | C Rochus | 7 | 4 | 6 | |||||||||||||||||||
| 8 | C Rochus | 6 | 6 | T Zíb | 2 | 4 | |||||||||||||||||||||
| 4 | F Santoro | 4 | 6 | 3 | J Mónaco | 6 | 6 | ||||||||||||||||||||
| J Vaněk | 6 | 3 | 6 | J Vaněk | 4 | 6 | 3 | ||||||||||||||||||||
| Q | G Simon | 6 | 3 | 6 | Q | G Simon | 6 | 3 | 6 | ||||||||||||||||||
| J Acasuso | 3 | 6 | 3 | Q | G Simon | 6 | 2 | 5 | |||||||||||||||||||
| D Sanguinetti | 65 | 4 | J Mónaco | 4 | 6 | 7 | |||||||||||||||||||||
| J Mónaco | 77 | 6 | J Mónaco | 77 | 6 | ||||||||||||||||||||||
| B Ulihrach | 2 | 1 | 5 | F Mayer | 64 | 0 | |||||||||||||||||||||
| 5 | F Mayer | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarter-finals | Semi-finals | ||||||||||||||||||||||||
| 6 | M Puerta | 6 | 6 | ||||||||||||||||||||||||
| T Behrend | 4 | 1 | 6 | M Puerta | 6 | 77 | |||||||||||||||||||||
| N Almagro | 6 | 6 | N Almagro | 3 | 62 | ||||||||||||||||||||||
| L Burgsmüller | 2 | 2 | 6 | M Puerta | 4 | 6 | 6 | ||||||||||||||||||||
| Q | M Gicquel | 1 | 7 | 6 | A Clément | 6 | 1 | 2 | |||||||||||||||||||
| Q |  M Mertiňák | 6 | 5 | 4 | Q | M Gicquel | 4 | 4 | |||||||||||||||||||
| A Clément | 7 | 6 | A Clément | 6 | 6 | ||||||||||||||||||||||
| 3 | L Horna | 5 | 2 | 6 | M Puerta | 6 | 78 | ||||||||||||||||||||
| 7 | G Müller | 7 | 6 | 2 | F Volandri | 3 | 66 | ||||||||||||||||||||
 J-R Lisnard | 5 | 2 | 7 | G Müller | 6 | 6 | |||||||||||||||||||||
 J Tipsarevic | 7 | 6 | J Tipsarevic | 3 | 4 | ||||||||||||||||||||||
| O Mutis | 5 | 3 | 7 | G Müller | 60 | 1 | |||||||||||||||||||||
 J Nieminen | 6 | 77 | 2 | F Volandri | 77 | 6 | |||||||||||||||||||||
 V Hănescu | 3 | 62 | J Nieminen | 6 | 1 | 4 | |||||||||||||||||||||
| WC | Y El Aynaoui | 3 | 65 | 2 | F Volandri | 3 | 6 | 6 | |||||||||||||||||||
| 2 | F Volandri | 6 | 77 | ||||||||||||||||||||||||
Rafael Nadal defeated Mariano Puerta in the final, 6–7(6–8), 6–3, 6–1, 7–5 to win the men's singles tennis title at the 2005 French Open. It was his first major title, the first of a record 14 French Open titles, and the first of a record 22 major men's singles titles overall. Nadal won the French Open on his tournament debut, the first man to do so since Mats Wilander in 1982, and was the youngest champion since Michael Chang in 1989, at 19 years and two days old when he won the title.
Tomáš Berdych defeated Ivan Ljubičić in the final, 6–3, 6–4, 3–6, 4–6, 6–4 to win the singles tennis title at the 2005 Paris Masters.
Gastón Gaudio defeated Mariano Puerta 6–4, 6–4 to win the 2005 ATP Buenos Aires singles competition. Guillermo Coria was the champion but did not defend his title.
Renzo Furlan was the defending champion, but did not participate this year.
Gilbert Schaller was the defending champion but lost in the final 7–5, 1–6, 6–2 against Tomás Carbonell.
Tomás Carbonell was the defending champion but lost in the quarterfinals to Gilbert Schaller.
Hicham Arazi was the defending champion, but lost in the quarterfinals this year.
Alberto Martín was the defending champion, but lost in the first round.
Fernando Vicente was the defending champion but lost in the first round to Mariano Zabaleta.
Guillermo Cañas was the defending champion but lost in the final 3–6, 6–3, 6–2 against Younes El Aynaoui.
Julien Boutter was the defending champion, but lost in the second round this year.
Roger Federer defeated Andy Roddick in the final, 6–3, 7–5 to win the men's singles tennis title at the 2005 Cincinnati Masters.
Mariano Puerta was the defending champion, but did not participate this year.
Andy Roddick was the defending champion and won in the final 7–6(9–7), 7–6(7–4) against Ivo Karlović.
Carlos Moyá was the defending champion, but lost in the second round to Mariano Puerta.
Martin Verkerk was the defending champion, but did not participate this year.
In the 2005 Austrian Open Singles, Nicolás Massú was the defending champion, but lost in the semifinals to Fernando Verdasco.
Rafael Nadal was the defending champion, but did not participate.
Albert Costa was the defending champion, but lost in the semifinals to Mariano Puerta.
The 1999 International Raiffeisen Grand Prix was a men's tennis tournament played on Clay in St. Pölten, Austria that was part of the World Series of the 1999 ATP Tour. It was the nineteenth edition of the tournament and was held from 17–23 May 1999.