Daniel Brands was the defending champion; however, he decided not to compete.
Julian Reister won this tournament, beating Alessio di Mauro 2–6, 6–3, 6–3 in the final.
Éric Prodon chose to not defend his last year's title.
Marius Copil was the defending champion but lost the final to Jürgen Zopp, 7–6(7–4), 7–6(7–4).
Jaroslav Pospíšil is the defending champion.
Evgeny Donskoy won the title after defeating Adrian Ungur 6–1, 6–3 in the final.
Simon Greul was the defending champion but lost in the final to Aljaž Bedene.
Rafael Nadal defeated Juan Martín del Potro in the final, 4–6, 6–3, 6–4 to win the men's singles title at the 2013 Indian Wells Masters. It was Nadal's third singles title at Indian Wells, his record 22nd ATP Masters 1000 title, and his 53rd title overall.
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.
Roberto Bautista-Agut was the defending champion but decided not to participate.
Julian Reister defeated Guillermo García-López 4–6, 6–3, 6–2 in the final to win the title.
Two-time defending champion Rafael Nadal successfully defended his title, defeating Nicolás Almagro in the final, 6–4, 6–3. It was his record-extending eighth Barcelona Open title.
Jonathan Dasnières de Veigy was the defending champion but decided to participate at the 2013 Tennis Napoli Cup instead.
Jiří Veselý won the final by defeating Steve Darcis 6–4, 6–4 in the final.
Andreas Haider-Maurer was the defending champion but had to compete at the 2013 US Open instead.
Andreas Haider-Maurer is the defending champion, and successfully defended his championship by defeating Gerald Melzer in all-Austrian final by a score of 6–7(9–11), 6–4, 6–2.
Adrian Ungur was the defending champion, but lost in the semifinals to Jaroslav Pospíšil.
Aljaž Bedene was the defending champion but chose not to compete.
Dominic Thiem won the title defeating Potito Starace in the final.
Lukáš Lacko was the defending champion, but lost to Jan-Lennard Struff in quarterfinals.
Jarkko Nieminen won the title, beating Ričardas Berankis in the final, 6–3, 6–1.
Jiří Veselý was the defending champion, but decided not to compete.
This was the first edition of the event.
Nicolas Mahut, the defending champion, lost 2–6, 4–6 in the final to Steve Darcis.
Diego Schwartzman was the defending champion, but chose not to participate.
Jean-Julien Rojer and Horia Tecău were the defending champions, and successfully defended their title, defeating James Cerretani and Leander Paes in the final, 6–2, 7–6(7–2).
Jan Hájek 
Andreas Haider-Maurer 
