As a junior, Andújar compiled a singles win–loss record of 67–16 (and 48–14 in doubles), reaching as high as No.

He made the final of the 2010 BCR Open Romania, where he lost to Juan Ignacio Chela.

In 2011, Andújar won his first ATP title at the Grand Prix Hassan II tournament in Morocco, defeating Italian Potito Starace in the final.

In January 2012, he was a finalist in doubles with Carlos Berlocq in Viña del Mar, Chile.

In April 2012, he won his second title in Morocco, defeating Albert Ramos Viñolas in the final.

Andújar reached his biggest final at the 2015 Barcelona Open where he was defeated by Kei Nishikori.

[2] In April 2018, Andújar won his fourth ATP tournament and his first in for four years, beating Kyle Edmund in straight sets in the final in Marrakesh to become the lowest-ranked tour-level titlist at World No.

75, Andújar upset Roger Federer in three sets at the Geneva Open and reached the semifinals of the event.

They entered the tournament as a replacement alternate pair for the top seeds Nikola Mektić/Mate Pavić.

He qualified to represent Spain in the 2020 Tokyo Olympics in singles and doubles partnering with Roberto Carballés Baena.

He finished the year 2021 with a positive record of 5–3 in Grand Slams for the first time in his career.

[9] At the Rio Open, he beat eighth seed, Albert Ramos Viñolas, in the second round in three sets.

[14] At the Grand Prix Hassan II in Marrakech, he upset second seed and world No.

Last year semifinalist at the Geneva Open, he lost in the first round to eventual finalist João Sousa.

[21] Seeded fourth at the Open Sopra Steria de Lyon, he was defeated in the first round by lucky loser Juan Bautista Torres.

[23] At the Generali Open Kitzbühel, he beat ninth seed, Lorenzo Sonego, in the first round.

[25] Seeded second at the first edition of the Kozerki Open, he retired from his second-round match against qualifier Alexey Vatutin due to an arm injury.

Andújar withdrew from the US Open due to the same arm injury he picked up while he was in Grodzisk Mazowiecki.

He retired during his first-round match against Argentinian wildcard and 2021 champion, Juan Manuel Cerúndolo, due to a right shoulder injury.

After his first-round loss, he said farewell, hoping to play one more match at the Valencia Challenger.