China's Olympic champion Zheng Qinwen said her peak is still to come after battling through a slump to reach the US Open quarterfinals on Monday.⁣ ⁣ Zheng staged another thrilling comeback from 5-0 down to beat eighth seed Iga Swiatek of Poland 7-5, 6-3 to secure a quarterfinal berth in the women's singles of the US Open on Monday.⁣ ⁣ However, affected by injuries in recent years, Zheng is currently ranked 121st in women's singles.⁣ ⁣ In an interview, Zheng opened up about the pain of her comeback, describing months of repeated defeats and self-doubt.⁣ ⁣ #China #ZhengQinwen #tennis #sports