Can Alcaraz's ex-coach help Shelton challenge his former protege?

How Ferrero gels with Shelton's dad - a former professional player who won two ATP titles - will be key.

Ferrero previously had an six-month spell coaching Zverev, which ended after a third-round Australian Open exit in 2018.

Ferrero was hired by Zverev as an outside voice coming into a father-son coaching dynamic, but the German fired him after claiming Ferrero was "disrespectful" to his team.

Ferrero later said Zverev lacked the professionalism he expected from a top player.

Shelton, known for having a strong work ethic and insatiable will-to-win, is likely to be receptive to Ferrero's demands - as long as they do not neutralise his raw weapons.