Carlos Moyá was the defending champion, but was eliminated in the round robin competition.
Juan Mónaco was the defending champion, but lost in the first round to Agustín Calleri.
Juan Ignacio Chela was the defending champion, but lost in the second round to Agustín Calleri.
Rafael Nadal defeated Guillermo Coria in the final, 6–4, 3–6, 6–3, 4–6, 7–6(8–6) to win the men's singles title at the 2005 Italian Open. Nadal was making his tournament debut.
Andy Murray defeated Novak Djokovic in the final, 6–2, 7–5 to win the men's singles tennis title at the 2009 Miami Open.
Four-time defending champion Rafael Nadal defeated Novak Djokovic in the final, 6–3, 2–6, 6–1 to win the singles tennis title at the 2009 Monte-Carlo Masters.
Rafael Nadal was the defending champion, but chose not to participate that year.
Carlos Berlocq and Frederico Gil were the defending champions. Berlocq didn't start this year.
Gil partnered up with Rui Machado, but they lost to Bracciali/Starace in the semifinal.
Daniele Bracciali and Potito Starace defeated Santiago Giraldo and Pere Riba in the final 6–3, 6–4.
Albert Montañés was the defending champion, but was defeated 1–6, 3–6 by Juan Ignacio Chela in the semifinals.
Chela went on to win the tournament, defeating qualifier Pablo Andújar 7–5, 6–1 in the final.
Thomaz Bellucci was the defending champion, but lost to Fabio Fognini in the quarterfinals.
Tommy Robredo won the title, defeating Santiago Giraldo 6–2, 2–6, 7–6(7–5), in the final.
Stanislas Wawrinka was the defending champion, but hasn't entered this year.
Pablo Andújar defeated Potito Starace 6–1, 6–2 in the final match.
Rafael Nadal defeated David Nalbandian in the final, 6–2, 6–3 to win the singles tennis title at the 2013 Brasil Open.
Rafael Nadal defeated the three-time defending champion David Ferrer in the final, 6–0, 6–2 to win the men's singles tennis title at the 2013 Mexican Open.
David Ferrer was the defending champion, but lost in the first round to Xavier Malisse.
Qualifier Nicolas Mahut won the first title of his career, beating Stanislas Wawrinka in the final, 6–3, 6–4.
Rafael Nadal was the defending champion but chose not to compete.
Viktor Troicki was the defending champion and successfully defended his title, defeating Grigor Dimitrov in the final, 2–6, 6–1, 7–6(9–7).
This article displays the qualifying draw for the Men's Singles at the 2004 US Open.
Two-time defending champion Rafael Nadal defeated Kei Nishikori in the final, 6–3, 6–2 to win the singles tennis title at the 2018 Monte-Carlo Masters. It was his record-extending 11th Monte-Carlo Masters title and his record 31st Masters title. By winning the title, Nadal also retained the ATP no. 1 singles ranking. He did not lose a single set during the tournament.
Lucas Pouille was the defending champion, but lost in the second round to Marcos Baghdatis.
Karen Khachanov was the defending champion, but withdrew before the tournament began.
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David Nalbandian 
Jarkko Nieminen 
