| Date: | 5–11 October |
| Edition: | 3rd |
| Surface: | Clay |
| Location: | Barcelona, Spain |
| Champs: |  Carlos Alcaraz |
| Champd: |  Szymon Walków /  Tristan-Samuel Weissborn |
The 2020 Sánchez-Casal Cup was a professional tennis tournament played on clay courts. It was the third edition of the tournament which was part of the 2020 ATP Challenger Tour. It took place in Barcelona, Spain between 5 and 11 October 2020.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Spain | Jaume Munar | 109 | 1 | |
 Australia | Christopher O'Connell | 112 | 2 | |
| Pedro Sousa | 113 | 3 | ||
 Bosnia and Herzegovina | Damir Džumhur | 114 | 4 | |
 Argentina | Facundo Bagnis | 129 | 5 | |
| Spain | Bernabé Zapata Miralles | 145 | 7 | |
| Spain | Carlos Taberner | 149 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw using a protected ranking:
The following players received entry into the singles main draw as special exempts:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
See main article: 2020 Sánchez-Casal Cup – Singles.
Carlos Alcaraz def. Damir Džumhur 4–6, 6–2, 6–1.See main article: 2020 Sánchez-Casal Cup – Doubles.
Szymon Walków / Tristan-Samuel Weissborn def. 
Harri Heliövaara / 
Alex Lawson 6–1, 4–6, [10–8].
