The Rio 2016 Olympic champion was unable to defend her women’s singles title at Tokyo 2020 last year, after suffering an anterior cruciate ligament injury for the second time in her career in June.

Marin’s last match had been the final of last year’s European Championships in Kyiv, where she secured a record fifth women’s singles crown.

The defending champion was cheered back onto court by a home crowd at the Centro Deportivo Municipal Gallur venue for her second-round match against the Czech Republic’s Katerina Tomalova.

Marin overcame Tomalova 21-10, 21-6 in 30 minutes to book her place in the third round.

She will face Ukraine’s Maria Ulitina, who came from a game down to win 19-21, 21-17, 21-6 against Portugal’s Sonia Goncalves.

Tournament second seed Mia Blichfeldt secured a 21-13, 21-7 win over Ukraine’s Polina Buhrova in the other half of the draw.

Blichfeldt will play Julie Dawall Jakobsen in an all-Danish third round match, after her compatriot beat Czech Republic’s Tereza Svabikova 21-15, 21-8.

Scotland’s Kirsty Gilmour and Denmark’s Line Christophersen, the women’s singles third and fourth seeds, were also winners in the second round.

Gilmour beat the Netherlands’ Gayle Mahlette 21-16, 21-11, while Christophersen was a 21-14, 21-11 winner against Slovenia’s Petra Polanc.

Olympic champion Viktor Axelsen secured victory in his opening match of the men’s singles tournament, as he seeks to win the event for the third time in his career.

The Danish star beat French wildcard Alex Lanier 21-12, 21-11 to reach the third round, where he will face Germany’s Max Weißkirchen.

Anders Antonsen, who beat his compatriot Axelsen in last year’s final, was forced to battle in his second round match against Germany’s Kai Hendrik Schafer.

Antonsen eventually won 21-17, 18-21, 21-13.

He will face Spain’s Luís Enrique Peñalver in the third round.

Hans-Kristian Vittinghus made it a trio of Danish top seeds to advance, after coming from a game down to beat Bulgaria’s Daniel Nikolov 12-21, 21-10, 21-17.