Zheng Qinwen cruised to a 6-1, 6-1 win over Jasmine Paolini to reach the semifinals of the WTA Finals on Wednesday. Zheng needed just over an hour to defeat Paolini in the match that decided the final qualifier from the Purple Group at the season-ending tournament for the top-ranked women’s players. It was Zheng’s fourth win in as many matches against the Italian.