Fabrice Santoro was the defending champion, but lost in the semifinals to Sam Querrey.
Andreas Seppi was the defending champion; however, he didn't take part in these championships this year.
Lukáš Rosol won in the final 6–1, 4–6, 7–6(3), against Benedikt Dorsch.
Robin Söderling was the defending champion, but he competed in the BNP Paribas Open instead.
Florian Mayer won in the final 6–4, 6–4, against Gilles Simon.
Bobby Reynolds was the defending champion. He was first-seeded player in the main draw, but he lost to José de Armas 4–6, 6–2, 2–6 in first round.
Benjamin Becker became the new champion, after he won 6–2, 3–6, 6–4, against Rajeev Ram in final.
Benjamin Becker was the defending champion but chose to compete in Monte Carlo instead.
Kevin Anderson won in the final 6–7(7), 7–6(7), 6–1 against Tobias Kamke.
Novak Djokovic was the defending champion, but decided not to participate.
Andreas Seppi won the title defeating Benoît Paire 6–3, 6–2 in the final.
Roger Federer was the defending champion, but lost to Juan Martín del Potro 6–4, 6–7(5–7), 7–6(7–3) in the final.
Roger Federer was the defending champion, but lost in the quarterfinals to Julien Benneteau.
Juan Martín del Potro won the title, defeating Benneteau in the final 7–6(7–2), 6–3.
The 2013 BNP Paribas Open – Men's Singles was the main event of the 2013 BNP Paribas Open men's tennis tournament played in Indian Wells, USA from March 7 through March 17, 2013.
Novak Djokovic was the defending champion, but lost in the fourth round to Tommy Haas. This championship was the first since the tournament's inception that no American was featured in the quarterfinals, with the last player from the US, Sam Querrey, beaten in the fourth round by Tomas Berdych. This meant that it was also the first all-European final eight at the Miami Masters.
Thiago Alves was the defending champion but chose to compete in the 2013 Taroii Open de Tênis instead.
Alex Bogomolov Jr. won the title after defeating Rajeev Ram 2–6, 6–3, 6–1 in the final.
Juan Martín del Potro was the defending champion and successfully defended his title, defeating Roger Federer in the final, 7–6(7–3), 2–6, 6–4.
Benjamin Becker is the defending champion, but lost in the quarterfinals to fifth seeded Teymuraz Gabashvili.
Top seed Andreas Seppi defeated surprise finalist Simon Greul.
Andreas Seppi was the defending champion. Seppi defended his title, defeating Matthias Bachinger in the final, 6–4, 6–3.
Novak Djokovic was the two-time defending champion, but lost to Andy Murray in the final, 3–6, 3–6. As of 2018, this is the last ever clay court tennis tournament featuring Roger Federer.
Sam Groth was the defending champion, but lost in the quarterfinals to Denis Kudla.
Roger Federer was the three-time defending champion, but lost in the semifinals to Alexander Zverev.
Kyle Edmund was the defending champion but chose not to defend his title.
Sam Querrey was the defending champion, but lost in the quarterfinals to Juan Martín del Potro.
Brian Battistone and Dann Battistone were the defending champions, but lost in quarterfinals to Martin Fischer and Philipp Oswald.
