Serena Williams hit a milestone on Instagram and celebrated with what she calls her "4 million followers dance." The 22-time Grand Slam champion was stunned in the third round of Rio by Elina Svitolina, but she's still living her best life, and celebrating the little things, like social media success.

The world No. 1, in danger of losing her grip on the top spot, accepted a wildcard to Cincinnati. Play starts next week.