| Date: | 8–14 October |
| Edition: | 1st |
| Surface: | Clay |
| Location: | Barcelona, Spain |
| Champs: |  Roberto Carballés Baena |
| Champd: |  Marcelo Demoliner / David Vega Hernández |
| After Name: | Sánchez-Casal Cup |
The 2018 Sánchez-Casal Mapfre Cup was a professional tennis tournament played on clay courts. It was the first edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Barcelona, Spain between 8 and 14 October 2018.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Spain | Roberto Carballés Baena | 97 | 1 | |
| Spain | Pablo Andújar | 117 | 2 | |
 Argentina | Marco Trungelliti | 133 | 3 | |
 Italy | Stefano Travaglia | 143 | 4 | |
| Pedro Sousa | 145 | 5 | ||
| Italy | Gianluigi Quinzi | 154 | 6 | |
| Spain | Sergio Gutiérrez Ferrol | 157 | 7 | |
 Slovakia | Andrej Martin | 166 | 8 |
The following players received wildcards into the singles main draw:
Bekkhan Atlangeriev Nicola Kuhn Álvaro López San Martín Miguel SemmlerThe following players received entry from the qualifying draw:
See main article: 2018 Sánchez-Casal Mapfre Cup – Singles.
Roberto Carballés Baena def. Pedro Martínez 1–6, 6–3, 6–0.See main article: 2018 Sánchez-Casal Mapfre Cup – Doubles.
Marcelo Demoliner / David Vega Hernández def. 
Rameez Junaid / David Pel 7–6(7–3), 6–3.
