ATP 250 · 2021-02-22 · draw of 32
Singapore 2021
HardFinal
| 🇦🇺 Alexei Popyrin | d. | 🇰🇿 Alexander Bublik | 4-6 6-0 6-2 | H2H |
Semifinals
| 🇰🇿 Alexander Bublik | d. | 🇲🇩 Radu Albot | 2-6 6-3 6-4 | H2H |
| 🇦🇺 Alexei Popyrin | d. | 🇭🇷 Marin Cilic | 7-6(5) 7-6(2) | H2H |
Quarterfinals
| 🇲🇩 Radu Albot | d. | 🇫🇷 Adrian Mannarino | 6-3 6-4 | H2H |
| 🇰🇿 Alexander Bublik | d. | 🇯🇵 Yoshihito Nishioka | 6-3 6-2 | H2H |
| 🇭🇷 Marin Cilic | d. | 🇰🇷 Soonwoo Kwon | 6-2 2-6 7-5 | H2H |
| 🇦🇺 Alexei Popyrin | d. | 🇦🇺 Matthew Ebden | 6-4 7-6(7) | H2H |
Round of 16
| 🇫🇷 Adrian Mannarino | d. | 🇮🇹 Roberto Marcora | 6-3 7-5 | H2H |
| 🇲🇩 Radu Albot | d. | 🇩🇪 Yannick Hanfmann | 6-7(2) 7-6(7) 6-3 | H2H |
| 🇰🇿 Alexander Bublik | d. | 🇹🇷 Altug Celikbilek | 6-2 6-2 | H2H |
| 🇯🇵 Yoshihito Nishioka | d. | 🇺🇸 Maxime Cressy | 6-4 6-2 | H2H |
| 🇰🇷 Soonwoo Kwon | d. | 🇯🇵 Yasutaka Uchiyama | 6-3 6-4 | H2H |
| 🇭🇷 Marin Cilic | d. | 🇯🇵 Taro Daniel | 7-5 6-4 | H2H |
| 🇦🇺 Alexei Popyrin | d. | 🇧🇬 Adrian Andreev | 6-1 5-7 6-3 | H2H |
| 🇦🇺 Matthew Ebden | d. | 🇦🇺 John Millman | 6-4 6-1 | H2H |
Round of 32
| 🇮🇹 Roberto Marcora | d. | 🇱🇻 Ernests Gulbis | 7-5 6-4 | H2H |
| 🇩🇪 Yannick Hanfmann | d. | 🇦🇺 James Duckworth | 6-2 6-4 | H2H |
| 🇲🇩 Radu Albot | d. | 🇦🇺 John-Patrick Smith | 6-2 3-6 6-1 | H2H |
| 🇹🇷 Altug Celikbilek | d. | 🇯🇵 Shintaro Mochizuki | 6-0 6-4 | H2H |
| 🇺🇸 Maxime Cressy | d. | 🇹🇼 Jason Jung | 7-6(4) 6-2 | H2H |
| 🇯🇵 Yoshihito Nishioka | d. | 🇺🇸 Michael Mmoh | 6-2 3-6 6-3 | H2H |
| 🇰🇷 Soonwoo Kwon | d. | 🇺🇸 Thai-Son Kwiatkowski | 4-6 6-3 6-4 | H2H |
| 🇯🇵 Yasutaka Uchiyama | d. | 🇦🇺 Marc Polmans | 6-4 2-6 6-4 | H2H |
| 🇯🇵 Taro Daniel | d. | 🇮🇳 Ramkumar Ramanathan | 6-3 6-7(3) 6-3 | H2H |
| 🇧🇬 Adrian Andreev | d. | 🇿🇦 Lloyd Harris | 1-6 6-3 6-4 | H2H |
| 🇦🇺 Alexei Popyrin | d. | 🇺🇸 Christopher Eubanks | 7-6(5) 7-6(5) | H2H |
| 🇦🇺 Matthew Ebden | d. | 🇮🇳 Yuki Bhambri | 6-3 7-6(3) | H2H |