Who, and Where, Is Peng Shuai?

A simple question has gripped the sports world and drawn the attention of the White House, United Nations and others:

Where is Peng Shuai?

The Chinese tennis star disappeared from public view for weeks this month after she accused a top Chinese leader of sexual assault, prompting a global chorus of concern for her safety. Then, this weekend, the editor of a Communist Party-controlled newspaper posted video clips that appear to show Ms. Peng eating at a restaurant and attending a tennis event in Beijing.

A top official in women’s tennis, Steve Simon, said it was “positive” to see the videos, though he said he remained skeptical that Ms. Peng was making decisions freely. China’s authoritarian…