Although Ferrero was known as one of the best clay-court players during his prime, he distinguished himself as an all-court and all-round player through his solid performance on hard- and grass-court tournaments. He said during an interview that he preferred playing on hard courts. Tennis experts agreed that Ferrero’s clay-court game translated well to the hard court due to his aggressive style of playing. He also had one of the greatest forehands in the game and immense speed on the court.
After retiring in 2012, it was announced that Juan Carlos would make a come back in the ATP World Tour, playing in the Barcelona doubles draw alongside Pablo Carreño Busta. However, this would be his only tournament.
In July 2017, Ferrero started working as a coach of then-No. 11 Alexander Zverev. The work ended in February 2018, and Now he is back to training the top academy players and especially with Carlos Alcaraz, one of the biggest junior promises.