| Singles | |
|---|---|
| 2021 Biella Challenger Indoor IV | |
| Champion |  Daniel Masur |
| Runner-up | Matthias Bachinger |
| Final score | 6–3, 6–7(8–10), 7–5 |
Andreas Seppi was the defending champion [1] but lost in the second round to Matthias Bachinger.
Daniel Masur won the title after defeating Bachinger 6–3, 6–7(8–10), 7–5 in the final.
Lucas Pouille (second round) Yannick Hanfmann (first round)
Andreas Seppi (second round)
Yūichi Sugita (first round) Yasutaka Uchiyama (first round)
Ilya Ivashka (first round) Grégoire Barrère (quarterfinals) Benjamin Bonzi (semifinals)| Semifinals | Final | ||||||||||||
 Illya Marchenko | 3 | 3 | |||||||||||
| Q | Daniel Masur | 6 | 6 | ||||||||||
| Q | Daniel Masur | 6 | 68 | 7 | |||||||||
| Q | Matthias Bachinger | 3 | 710 | 5 | |||||||||
| Q | Matthias Bachinger | 7 | 6 | ||||||||||
| 8 | Benjamin Bonzi | 5 | 4 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | L Pouille | 6 | 78 | ||||||||||||||||||||||||
| Alt | Q Halys | 2 | 66 | 1 | L Pouille | 4 | 3 | ||||||||||||||||||||
| I Marchenko | 6 | 7 | I Marchenko | 6 | 6 | ||||||||||||||||||||||
| WC | F Cobolli | 3 | 5 | I Marchenko | 710 | 6 | |||||||||||||||||||||
| WC | S Napolitano | 65 | 6 | 4 | 7 | G Barrère | 68 | 1 | |||||||||||||||||||
| Alt |  Z Kolář | 77 | 0 | 6 | Alt | Z Kolář | 2 | 4 | |||||||||||||||||||
 A Vukic | 5 | 65 | 7 | G Barrère | 6 | 6 | |||||||||||||||||||||
| 7 | G Barrère | 7 | 77 | I Marchenko | 3 | 3 | |||||||||||||||||||||
| 4 | Y Sugita | 64 | 77 | 3 | Q | D Masur | 6 | 6 | |||||||||||||||||||
| Q | D Masur | 77 | 63 | 6 | Q | D Masur | 7 | 64 | 6 | ||||||||||||||||||
| Q | J Forejtek | 6 | 62 | 6 | Q | J Forejtek | 5 | 77 | 4 | ||||||||||||||||||
| PR | D Brown | 3 | 77 | 4 | Q | D Masur | 77 | 6 | |||||||||||||||||||
| S Stakhovsky | 7 | 5 | 6 | S Stakhovsky | 63 | 4 | |||||||||||||||||||||
| WC | M Gigante | 5 | 7 | 2 | S Stakhovsky | 7 | 3 | 77 | |||||||||||||||||||
 M-A Hüsler | 6 | 77 | M-A Hüsler | 5 | 6 | 65 | |||||||||||||||||||||
| 5 | Y Uchiyama | 2 | 63 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | I Ivashka | 3 | 7 | 4 | |||||||||||||||||||||||
| Y Maden | 6 | 5 | 6 | Y Maden | 3 | 4 | |||||||||||||||||||||
 S Ofner | 6 | 6 | S Ofner | 6 | 6 | ||||||||||||||||||||||
| LL |  N Kuhn | 2 | 2 | S Ofner | 65 | 0r | |||||||||||||||||||||
| Q | M Bachinger | 77 | 2 | 6 | Q | M Bachinger | 77 | 1 | |||||||||||||||||||
| Q | A Santillan | 64 | 6 | 4 | Q | M Bachinger | 6 | 7 | |||||||||||||||||||
| LL |  J Sock | 6 | 3 | 3 | 3 | A Seppi | 3 | 5 | |||||||||||||||||||
| 3 | A Seppi | 4 | 6 | 6 | Q | M Bachinger | 7 | 6 | |||||||||||||||||||
| 8 | B Bonzi | 65 | 6 | 6 | 8 | B Bonzi | 5 | 4 | |||||||||||||||||||
| J Rodionov | 77 | 4 | 4 | 8 | B Bonzi | 77 | 77 | ||||||||||||||||||||
| Alt | T Kamke | 6 | 6 | Alt | T Kamke | 62 | 63 | ||||||||||||||||||||
 E Ymer | 2 | 2 | 8 | B Bonzi | 6 | 77 | |||||||||||||||||||||
| B Tomic | 77 | 6 | M Bourgue | 3 | 64 | ||||||||||||||||||||||
| R Marcora | 65 | 1 | B Tomic | 3 | 2 | ||||||||||||||||||||||
| M Bourgue | 7 | 4 | 6 | M Bourgue | 6 | 6 | |||||||||||||||||||||
| 2 | Y Hanfmann | 5 | 6 | 3 | |||||||||||||||||||||||
Ivo Karlović was the defending champion, and won in the final 7–5, 6–7(4–7), 7–6(10–8), against Fernando Verdasco.
Tommy Robredo was the defending champion, but chose not to participate that year.
Sergiy Stakhovsky was the defending champion, but lost in the quarterfinals to Viktor Troicki.
Filippo Volandri was the defending champion, but he lost to Daniel Köllerer in the second round.
Andreas Seppi defeated Potito Starace 7–6(4), 2–6, 6–4 in the final.
Michaël Llodra was the defending champion, but chose not to compete.
Andreas Seppi was the defending champion, but he lost in the quarterfinals to Robin Haase.
Robin Haase won the title, defeating Albert Montañés 6–4, 4–6, 6–1 in the final.
Roger Federer was the defending champion, but was forced to withdraw from the tournament before the semifinals because of a back injury. Following Federer's withdrawal, Stefan Edberg and Jo-Wilfried Tsonga played a one set exhibition match to make up the evening session.
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.
Andreas Seppi was the defending champion, but lost in the final to Andy Roddick, 6–3, 6–2.
Janko Tipsarević was the defending champion, but decided to participate at 2012 Erste Bank Open instead.
Andreas Seppi won the final over Brazilian Thomaz Bellucci with the score 3–6, 7–6(7–3), 6–3.
Roger Federer was the defending champion, but was eliminated by Tomáš Berdych in the semifinals.
Novak Djokovic won the title, defeating Berdych in the final, 7–5, 6–3.
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.
Rafael Nadal defeated Juan Martín del Potro in the final, 4–6, 6–3, 6–4 to win the men's singles tennis title at the 2013 Indian Wells Masters. It was Nadal's third Indian Wells singles title, his record 22nd ATP Tour Masters 1000 title, and his 53rd title overall.
Andy Murray defeated David Ferrer in the final, 2–6, 6–4, 7–6(7–1) to win the men's singles tennis title at the 2013 Miami Open. It was his second Miami Open title.
Gilles Simon was the defending champion, but lost in the semifinals to Lukáš Rosol.
Rosol went on to win his first ATP World Tour title of his career, defeating Guillermo García López in the final, 6–3, 6–2.
Andreas Seppi was the defending champion, but lost in the semifinals to Mikhail Kukushkin.
Richard Gasquet won the title, defeating Kukushkin in the final, 4–6, 6–4, 6–4.
Andreas Seppi was the defending champion. Seppi defended his title, defeating Matthias Bachinger in the final, 6–4, 6–3.
Marin Čilić was the two-time defending champion, but withdrew before the tournament started due to an arm injury.
Leonardo Mayer was the defending champion, but chose not to participate this year.
Borna Ćorić was the defending champion, but retired from his quarterfinal match against Pierre-Hugues Herbert.