Serena Williams and Caroline Wozniacki watched the Heat advance to the NBA Finals. (Mike Ehrmann / Getty Images)

Caroline Wozniacki stirred up all sorts of speculation about what she might be up to when, after her broken engagement to Rory McIlroy, she changed her Twitter avatar to a Halloween photo in which, dressed as a witch, she mischievously stirred a cauldron.

The lovelorn tennis player, who was bounced from the French Open in the first round, grabbed Serena Williams, who’d also lost in the first lost in the second round, and headed to Miami to watch the Heat advance to the NBA Finals with a victory over the Indiana Pacers.

So far, there’s no need for McIlroy to worry. This looks pretty harmless.