Serena Williams, the 23-time Grand Slam singles champion and one of tennis' greatest players, has spoken about retirement - saying she is "evolving away" from the sport after the US Open.
In an accompanying Instagram post, she wrote that "the countdown has begun".
"I'm gonna relish these next few weeks," the 40-year-old said.
Williams made her singles return at Wimbledon in June after a lengthy injury lay-off that had led to speculation about her retirement.
She says she will play at the US Open, where she has won six of her major singles titles, later in August.