Qin Haiyang of China competes in the men’s 100-meter breaststroke semifinal at the World Aquatics Championships in Fukuoka, Japan, on Sunday. He would go on to win the final the following day. Photo: David J. Phillip /VCG

Qin celebrates after winning in the final of the men’s 100-meter breaststroke on Monday. He won the title in 57.69 seconds, breaking the previous breaststroke Asian record he set in Sunday’s semifinals by 0.13 seconds. Photo: VCG

Qin dives into the pool in the final event. The 24-year-old is the first Chinese swimmer to win a breaststroke world title. Photo: Yuichi Yamazaki/VCG

Zhang Yufei of China emerges victorious at the women’s 100-meter butterfly final at the World Aquatics Championships on Monday. Photo: VCG

Zhang (right) competes in the women’s 100-meter butterfly final. Photo: Adam Pretty/VCG

Zhang is thrilled with her 56.12 second win securing her first world title in the women’s 100-meter butterfly. Photo: Eugene Hoshiko/VCG

Zhang receives her gold medal at the tournament. Photo: Eugene Hoshiko/VCG

Team China composed of (from left to right) Cheng Yujie, Wu Qingfeng, Zhang and Yang Junxuan celebrate after winning bronze in the women’s 4x100 meter freestyle relay on Sunday. Photo: Manan Vatsyayana/VCG

Qin poses for a group photo with silver medalists (from left to right) Nic Fink of the U.S., Arno Kamminga from the Netherlands and Italy’s Nicolò Martinenghi during the medal ceremony for the men’s 100-meter breaststroke. Photo: Adam Pretty/VCG