BBC research has cast doubt on the timing of the positive Covid test Novak Djokovic used to enter Australia to try to compete in the Australian Open.

Documents submitted by his lawyers to federal court in Australia included two Covid (PCR) test certificates, one with a positive result on 16 December and one with a negative result on 22 December.

However, the serial number on his positive test appears out of sequence with a sample of tests from Serbia over the same period gathered by the BBC.

It is also higher than for his second (negative) test result from six days later.

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