Yesterday, Jannik Sinner reunited with his old fitness trainer Umberta Ferrara, after the pair split at the end of last year due to Ferrara being involved with the Italian's controversial positive doping test.

The feud between tennis stars Jannik Sinner and Nick Kyrgios has reignited after the Wimbledon champion rehired the coach who unwittingly became embroiled in the Italian's doping scandal.

World number one Jannik Sinner reappoints fitness coach Umberto Ferrara less than a year after they parted company.