| Singles | |
|---|---|
| 2003 Siebel Open | |
| Champion |  Andre Agassi |
| Runner-up |  Davide Sanguinetti |
| Score | 6–3, 6–1 |
| Draw | 32 (4Q / 3WC) |
| Seeds | 8 |
The 2003 Siebel Open was a men's international tennis tournament. Lleyton Hewitt was the defending champion but did not compete that year.
Andre Agassi won in the final 6–3, 6–1 against Davide Sanguinetti.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
Andre Agassi (champion)
Paradorn Srichaphan (first round) James Blake (semifinals) Jan-Michael Gambill (second round) Todd Martin (second round) Davide Sanguinetti (final)
Nikolay Davydenko (quarterfinals)
Kenneth Carlsen (quarterfinals)Rafael Nadal defeated Andre Agassi in the final, 6–3, 4–6, 6–2 to win the men's singles tennis title at the 2005 Canadian Open.
Greg Rusedski was the defending champion of the singles event of the Heineken Open tennis tournament, held in Auckland, New Zealand, but did not compete that year.
Andy Roddick was the defending champion but lost in the final 3–6, 6–3, 6–4 against Andre Agassi.
Andre Agassi defeated Marc Rosset in the final, 6–3, 6–3, 4–6, 7–5 to win the singles tennis title at the 1994 Paris Open.
Andre Agassi defeated Jason Stoltenberg in the final, 6–4, 6–4 to win the men's singles tennis title at the 1994 Canadian Open.
Defending champion Andre Agassi defeated Pete Sampras in the final, 3–6, 6–2, 6–3 to win the men's singles tennis title at the 1995 Canadian Open.
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.
Juan Carlos Ferrero defeated Nicolás Massú in the final, 6–3, 6–4, 6–3 to win the singles tennis title at the 2003 Madrid Open.
Roger Federer was the defending champion but lost in the final 7–6(7–2), 4–6, 6–1 against Davide Sanguinetti.
Magnus Larsson was the defending champion but did not compete that year.
Mark Philippoussis was the defending champion but lost in the second round to Juan Balcells.
Peter Wessels was the defending champion but lost in the second round to James Blake.
Tim Henman was the defending champion but did not compete that year.
Mark Philippoussis was the defending champion but lost in the first round to Jonas Björkman.
The 2002 Siebel Open was a men's international tennis tournament that took place from February 25 to March 3, 2002. Greg Rusedski was the defending champion but lost in the second round to Todd Martin.
Davide Sanguinetti was the defending champion but lost in the quarterfinals to Martin Verkerk.
Wayne Black and Kevin Ullyett were the defending champions but only Black competed that year with Mark Philippoussis.
Andre Agassi was the defending champion but lost in the semifinals to Mardy Fish.
Andre Agassi was the defending champion but lost in the final 6–2, 6–3 against Pete Sampras.
The 1998 Croatia Open Umag was a tennis tournament played on outdoor clay courts in Umag, Croatia that was part of the International Series of the 1998 ATP Tour. The tournament was held from July 27 through August 2, 1998.
