Correctional Services said that “matters are under control” at Johannesburg’s Sun City Prison on Wed.
Australia's former world number one Lleyton Hewitt has hired compatriot Tony Roche as his new coach.
Roche split with Roger Federer before this year's French Open and has also worked with Pat Rafter and Ivan Lendl.
Hewitt, 26, currently ranked 21st, said: "Rochey and I have had a great relationship over the years." - BBC