Juan Ignacio Londero mainly plays on the ATP Challenger Tour and the ITF Future Tour . So far, he has celebrated four single and four double victories on the Future Tour. He celebrated his first victory on the Challenger Tour alongside his partner Luis David Martínez when they won the final at the Milex Open in straight sets. On June 9, 2014, he broke through the top 200 of the world rankings in singles for the first time and his highest ranking was a 186th place in September 2014.
He made his debut in singles on the ATP World Tour in July 2013 at the Claro Open Colombia , where he qualified for the main round, but then lost in the opening round to Ivo Karlović in two sets. The following year he was able to qualify again for the main field of the Claro Open Colombia , but also failed here in the first main round to Víctor Estrella .