In the mixed 4x100m medley relay, a new event added to the Tokyo Games program, a team comprised of Xu, Zhang, Yang and Yan Zibei (men's breaststroke) had their chemistry further tested in Qingdao.

The same team set the event's world record (3:38.41) at the national championships in October 2020, bettering the previous mark held by American swimmers by 0.15 sec.

The Tokyo Olympics' nine-day swimming program will be staged from July 24-Aug 1.

A total of 33 Chinese swimmers have qualified for the Games. Each country or region is permitted to send a maximum of 56 swimmers, two for each of the 14 events on both the men's and women's sides. Next month's summer championships will be the final trial for Chinese swimmers to compete for the remaining spots.