[13][15] She won her first major title at the Irish International tournament coming through the qualification stage and beating the Dutch player Rachel Van Cutsen in the final in the rubber game.

[16][17] In 2011, she alongside her teammate, Beatriz Corrales, made history for the Spanish badminton, after placing two representatives of Spain in the final at the continental European Junior Championships held in Vantaa, Finland, and Marín grabbed the gold medal.

[18] She also competed at the World Junior Championships in Taipei, reaching the semi-finals, but lost to Elisabeth Purwaningtyas of Indonesia and settled for the bronze medal.

[20] In August, Marín played for the Bangalore-based team Banga Beats in the inaugural edition of the Indian Badminton League (IBL).

On 5 April, Marín won her second straight Superseries Premier title, beating Olympic champion Li Xuerui for the second consecutive time at the 2015 Malaysia Open with a score of 19–21, 21–19, 21–17.

She arrived at Rio as the number one seed and won a gold medal by beating India's P. V. Sindhu in the women's singles final with a score of 19–21, 21–12, 21–15.

[34] At the Hong Kong Open, which took place in late November, Marín retired to Michelle Li, losing 21–19, 13–21, 8–11, due to a hip injury that she sustained during the match.

Marín later announced on Twitter and Instagram that, due to her hip injury, she would not be participating in the season-ending Dubai World Superseries Finals.

[35] On 29 April 2018, she won her fourth consecutive European Championships title in her home soil Huelva, Spain, by beating Evgeniya Kosetskaya with a score of 21–15, 21–7 in the final.

[38] On 27 January, Marín suffered a ruptured anterior cruciate ligament (ACL) injury during the Indonesia Masters final against Saina Nehwal, when she was 10–3 ahead in the first games.

[39] She had a four-month recovery, dedicating ten hours a day to physical and technical rehabilitation, with morning and afternoon physiotherapy sessions, and swimming pool work.

[40] In September, after an eight-month break forced by the injury, Marín returned to competition at the 2019 Vietnam Open but suffered an opening-round defeat to Supanida Katethong.

[44][45] Marín started the 2020 season at the Southeast Asian tour on a positive note; reaching the semi-finals of Malaysia Masters where she lost to Chen Yufei.

[46] She continued her good form and thereafter reached the semi-finals of Thailand Masters, which she lost to top seed Akane Yamaguchi in a close rubber game.

[47] In February, she reached the final of her home event Barcelona Spain Masters, where she lost in an upset to rising Thai star Pornpawee Chochuwong in the rubber games 21–11, 16–21, 18–21.

[56][57] Marín made history as the first-ever player to claim five consecutive titles at the European Championships, defeating young Dane Line Christophersen in the final.

[58] She was expected to defend her title at the 2020 Tokyo Olympics but was forced to withdraw due to knee injury she suffered in June while training.

[60] Her best result in the 2022 BWF World Tour was reaching the French Open final, but lost the match to He Bingjiao in a close rubber games.

[61] Marín began 2023 at the Malaysia Open, the first Super 1000 event of the year, reaching the quarter-finals before losing to Chen Yufei in two close games.

[65] In March, Marín reached the quarter-finals of All England Open Championship but withdrew due to injury, giving An Se-young a walkover.

[67] Marín claimed her first title in over two years at the Orléans Masters, a Super 300 event, after defeating Beiwen Zhang in a three-game final.

[70] However, She rebounded at the Indonesia Open, a Super 1000 event, defeating Goh Jin Wei, Yeo Jia Min, Tai Tzu-ying, and Ratchanok Intanon to reach the final.

[71] Marín capped off June by representing Spain at the European Games, winning her first gold medal in the tournament with a straight-game victory over Mia Blichfeldt.

She reached the final of the Denmark Open, with a notable quarter-finals win over Tai Tzu-ying, there she lost to Chen Yufei in straight games.

In June, entering Indonesia Open as the third seed, Marín overpowered Zhang Yiman, Hsu Wen-chi, and Han Yue with straight wins before losing to Chen Yufei after three games in the semi-finals.

Entering the Olympics as the fourth seed, Marín advanced effortlessly through the group stage with straight wins against unseeded players Jenjira Stadelmann and Rachael Darragh.