Hewitt, 76, had his challenge against the sentence dismissed by the Supreme Court of Appeal earlier in the month, and is now heading to the Constitutional Court to argue for the sentence to be reduced.
Hewitt's lawyers had argued that the he suffered from ill-health, and also pointed to the length of time between when the offences were committed and the trial. The allegations first surfaced in 2011.
Hewitt was a doubles and mixed doubles champion at all four grand slam events, winning seven Wimbledon titles. He was expelled earlier this year from the International Tennis Hall of Fame following his conviction.
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(Reporting by Mfuneko Toyana; Editing by Dominic Evans)
