Some of the world's top tennis players have said they do not want to receive a coronavirus vaccine, triggering a major debate within the sport.
Both the ATP and WTA governing bodies have called for players to be immunised, but insist they will not force them to be vaccinated.
Leading stars in both the men's and women's game - including Novak Djokovic and Elina Svitolina - have expressed scepticism over Covid-19 vaccines.
Last year, Djokovic said he was "opposed to vaccination" before embarking on a controversial exhibition tour in Serbia and Croatia that was attended by fans.