Former US Open champion Juan Martin del Potro said his recovery from knee surgery had been challenging.
Christian Coleman is set to miss next year's Olympic Games after being banned for two years by the Athletics Integrity Unit.
Dani Ceballos and Sergio Ramos could team up for Spain at Euro 2020 and the Tokyo Olympics, which have both been put back to next year.
NBA commissioner Adam Silver does not foresee the season stopping to give its players the chance to compete in the rearranged Olympic Games.
Cathy Freeman had one of the most iconic Olympic moments 20 years ago on Friday when she won 400 metres gold in Sydney.
A December tip-off for the new season was tentatively flagged previously but Adam Silver said the NBA is set to be pushed back to January.
The CBF said it is committed to treating men and women equally, as it announced Brazil Women will be paid at the same rate as Neymar and Co.
RUSADA's director general has been removed by the Russian Olympic and Paralympic Committee. iNADO highlights "a clear conflict of interest".
On the day that should have seen the start of Tokyo 2020, we look at those whose dreams of an Olympic farewell were delayed, or even denied.
Yoshiro Mori thinks the Olympics will go ahead in Tokyo next year, but believes finding a coronavirus vaccine will be key.