Competitors for 2018 Marathon Swimming World Series
| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| Samantha Arévalo |  ECU |
OWS/SWI | 30 September 1994 |
| Ana Marcela Cunha |  BRA |
OWS/SWI | 23 March 1992 |
| Viviane Jungblut | BRA |
OWS/SWI | 29 June 1996 |
| Fernando Ponte | BRA |
OWS | 18 July 1992 |
| Marcel Schouten |  NED |
OWS | 18 June 1993 |
| Diogo Villarinho | BRA |
OWS/SWI | 11 March 1994 |