Zac Stubblety-Cook lost his 200m breaststroke world record last year to China’s Qin Haiyang, who tested positive to a banned substance before the Tokyo Olympics. Zac Stubblety-Cook lost his 200m breaststroke world record last year to China’s Qin Haiyang, who tested positive to a banned substance before the Tokyo Olympics. Sport / Swimming Sydney Morning Herald – Latest News