Rome, July 23 -- World number one Jannik Sinner has re-appointed fitness coach Umberto Ferrara, with whom he parted ways following the investigation into his positive tests for a banned substance.
Ferrara and physiotherapist Giacomo Naldi left the Italian's team last August, five months after Sinner returned two positive tests for clostebol.
"Umberto has played an important role in Jannik's development to date, and his return reflects a renewed focus on continuity and performance at the highest level," a statement from Sinner's team read.
"The decision has been made in alignment with Jannik's management team as part of ongoing preparations for upcoming tournaments, including the Cincinnati Open and US Open."
Sinner was cleared by an ind...