With tiebreak thrillers and narrow escapes behind them, the final four doubles teams prepare for a high-stakes semifinal matchups at the WTA Finals in Riyadh.

It took Zheng a little longer to get going. She lost her opener to Aryna Sabalenka, and nearly lost the first two sets to Elena Rybakina. But something clicked in the third. She won it 6-1, then ...

Going into the final day of round-robin matches, Sabalenka, Zheng, and Gauff had already qualified for the semifinals. The ...