Alva Review-Courier -

Some of the world's most famous tennis players, distraught by the disappearance of colleague Peng Shuai, are challenging China's Communist Party to get answers.

So far it's a standoff with little visible impact as tennis greats like Roger Federer and Rafael Nadal — joined by tennis governing bodies, human rights groups, retired players, and several athletes' lobbies — try to turn their profiles into power.

Peng, a two-time Grand Slam champion and former No. 1 in doubles, disappeared after making allegations of sexual assault over two weeks ago against former vice premier Zhang Gaoli, who was a...