Jehue Gordon and Bohdan Bondarenko both celebrated gold medals in an action-packed day at the world athletics championships in Moscow.
Trinidad and Tobago athlete Gordon was the victor in an exhilarating men's 400m hurdles final.
Gordon was matched all the way by Olympic silver medalist Michael Tinsley before he edged out the American by one hundredth of a second to cross in a time of 47.69 seconds.
Olympic champion Felix Sanchez failed to put forward a challenge for first place, eventually slumping to a fifth-place finish.
Ukrainian Bondarenko, meanwhile, had two attempts to break a 20-year world record as he took centre stage in the men's high jump.
The 23-year-old was looking to beat the 2.45m milestone set by Cuba's Javier Sotomayor in 1993, but he clattered into the bar on his final attempt.
Bondarenko, though, was still triumphant after clearing 2.41m. Qatar's Mutaz Essa Barshim and Canadian Derek Drouin took second and third respectively, both jumping 2.38m.
In the women's 400m hurdles, Czech Zuzana Hejnova fell narrowly short of achieving a world record of her own as she romped home in a time of 52.83secs.
Hejnova was particularly impressive in the home straight, leaving American duo Dalilah Muhammad and defending champion Lashinda Demus in her wake.
Shelly-Ann Fraser-Pryce will go head to head with Allyson Felix in the final of the women's 200m on Friday.
The Jamaican is gunning for a 100m and 200m sprint double and breezed through her semi-final on Thursday, as did Olympic champion Felix.
Caterine Ibarguen overcame the disappointment of a second-place finish at the London Olympic Games to claim World Championships gold in the women's triple jump.
The Colombian failed with her first attempt but landed her second jump to post a distance of 14.85m. Russian Ekaterina Koneva and defending world champion Olha Saladuha took the silver and bronze medals.
Meanwhile, Sweden's Abeba Aregawi powered past American Jenny Simpson in the last 200m to take gold in the women's 1500m, while Kenya's Ezekiel Kemboi broke for home with 600m remaining to top the podium in the men's 3000m steeplechase, his third successive win in the event at the World Championships.