2021 Sardegna Open
The 2021 Sardegna Open was a tennis tournament on the 2021 ATP Tour. It was played on outdoor clay courts in Cagliari, Sardinia, Italy. It was organised with a single-year licence in 2021, and was held at Tennis Club Cagliari from April 5 to 11, 2021.
The ATP 250 tournament debuted October 2020 as a response to the COVID-19 pandemic to increase earning opportunities for players. It returned to Sardegna in 2021 and opened the red-clay season in Europe.
Champions
Singles
Lorenzo Sonego def. Laslo Đere, 2–6, 7–6, 6–4Doubles
Lorenzo Sonego / Andrea Vavassori def. Simone Bolelli / Andrés Molteni, 6–3, 6–4Points and prize money
Prize money
| Event | W | F | SF | QF | Round of 16 | Round of 32 | Q2 | Q1 |
| Singles | €40,100 | €28,750 | €20,465 | €13,650 | €8,770 | €5,275 | €2,580 | €1,340 |
| Doubles* | €14,970 | €10,730 | €7,060 | €4,590 | €2,690 |
*per team
Singles main-draw entrants
Seeds
Other entrants
The following players received wildcards into the main draw:The following players received entry from the qualifying draw:
Withdrawals
;Before the tournament- Jérémy Chardy → replaced by João Sousa
- Cristian Garín → replaced by Federico Coria
- Aslan Karatsev → replaced by Lorenzo Musetti
- Thiago Monteiro → replaced by Andrej Martin
- Fernando Verdasco → replaced by Yannick Hanfmann
Doubles main-draw entrants
Seeds
- Rankings are as of March 22, 2021.
Other entrants
The following pairs received wildcards into the doubles main draw:The following pair received entry using a protected ranking:
Withdrawals
;Before the tournament- Rajeev Ram / Joe Salisbury → replaced by Harri Heliövaara / Denys Molchanov
- Jonny O'Mara / Ken Skupski → replaced by Lloyd Glasspool / Jonny O'Mara