Jannik Sinner has been worn down "physically and mentally" by the investigation into his positive tests for a banned substance, says the world number one's coach Darren Cahill.
The Italian twice tested positive in March for clostebol - a steroid that can be used to build muscle mass - but was cleared of fault or negligence by an independent tribunal last week.
The International Tennis Integrity Agency (ITIA) found Sinner was inadvertently contaminated with the substance by Giacomo Naldi, his physiotherapist.
Since first alerted about the doping violations in early April, Sinner has won tournaments in Halle and Cincinnati and become world number one for the first time in his career.