Hernández won his first ATP doubles title at the 2021 Croatia Open Umag partnering Fernando Romboli defeating top seeds Tomislav Brkić from Bosnia and Herzegovina and Nikola Ćaćić from Serbia.

[1] In April, Vega Hernández won his second ATP 250 doubles title at the 2022 Grand Prix Hassan II alongside new partner Rafael Matos.

[2] At the 2022 French Open on his Grand Slam debut the pair reached the third round with a win over Łukasz Kubot and Édouard Roger-Vasselin but not before defeating 13th seeded pair of Santiago González and Andrés Molteni.

They reached the quarterfinals where they lost to 12th seeded pair of Marcelo Arévalo and Jean-Julien Rojer.

He reached the semifinals at the 2023 Córdoba Open with Rafael Matos saving a match point.