The 20-year-old became the youngest winner of the BMA PGA Championship, the European Tour’s flagship event, last year and was the youngest winner in European Tour history when he landed the 2010 Castelló Masters at 17 years and 188 days.
The World No 42 had been as high as 25 during 2013 and this year he is expected to make a big push towards the European Ryder Cup team.
It may be seen as a gamble to change equipment at such a crucial stage of his career, especially after what happened to Rory McIlroy last year, but Manassero is convinced the switch will only do him good.
“After testing lots of different products, I am very happy to be joining Callaway and I am really excited to use their whole range of equipment,” said Manassero, already a four-time winner on Tour.
“I’m really impressed with everything so far and the Callaway Team has been fantastic. I’m looking forward to starting the 2014 season with my new clubs at Volvo Golf Champions this week.”
Manassero burst onto the scene as a 16-year old amateur becoming the youngest – and first Italian – to win the Amateur Championship in 2009, and in the same year became the youngest winner of the Silver Medal awarded to the leading amateur in The Open Championship at Turnberry
He also became the youngest player at 16 to make the cut at the US Masters, where he finished 36th in 2010 – the best performance by a European amateur for 73 years.
The Italian joins FedEx Cup and Race To Dubai winner Henrik Stenson at Callaway, with the Swede signing up to the brand after using some of their equipment to such good effect last season.
The manufacture has been making a big push in recent signings in golf’s equivalent of the transfer window, having recently signed up Pat Perez and the highly thought-of Harris English in recent weeks.