Around 2016, El Guincho saw Spanish singer Rosalia live, and fascinated by her sound he contacted her through social media looking to do a collaboration. He would end up as the sole producer of her sophomore album "El Mal Querer", released in 2018. The album received critical acclaim. At the 19th Latin Grammy Awards, the single "Malamente" was nominated for five awards including Record of the Year, Song of the Year, Best Urban Fusion Performance and Best Alternative Song, winning the latter two, and at the next year's ceremony, the album won for Album of the Year, Best Contemporary Pop Vocal Album and Best Recording Package, while the song "Pienso en tu mirá" was nominated for Best Pop Song. El Guincho personally won a Best Engineered Album.