Trinidad & Tobago's Jehue Gordon pipped American Michael Tinsley to the men's 400m hurdles title at the World Athletics Championships in Moscow.
Gordon, 21, clocked 47.69 seconds, the fastest in the world this year, with Olympic silver medallist Tinsley taking silver with a personal best of 47.70.
Ezekiel Kemboi won his third straight 3,000m steeplechase world title, with fellow Kenyan Conseslus Kipruto second.
Ukraine's Bohdan Bondarenko won the men's high jump with a leap of 2.41m.
Zuzana Hejnova of the Czech Republic won the women's 400m hurdles, Sweden's Abeba Aregawi the women's 1500m and Caterine Ibarguen of Colombia the women's triple jump.
Gordon hunted down the fast-starting Tinsley over the second 200m and won courtesy of a lunging finish. Serbia's Emir Bekric finished third in 48.05.
Gordon's was his country's first World Championships gold medal since Ato Boldon won the 200m crown in 1997.
The flamboyant Kemboi, who clocked eight minutes and 6.01 seconds, pointed across to the 18-year-old Kipruto (8:06.37) as he crossed the line in a gesture of defiance. Frenchman Mahiedine Mekhissi-Benabbad (8:07.86) finished third.
Kemboi, 31, matches Moses Kiptanui's three successive world titles, won between 1991 and 1995.
Bondarenko had three failed attempts at Javier Sotomayor's world record of 2.45m but had already seen off Qatar's Mutaz Essa Barshim (2.38m), who in turn beat Canada's Derek Drouin on countback.
Olympic bronze medallist Hejnova came on strong in the second half of the race to clock 52.83 seconds, the fastest time in the world this year.
Americans Dalilah Muhammad (54.09) and Lashinda Demus (54.27), the defending champion, finished second and third respectively.
Aregawi, formerly of Kenya, clocked four minutes, 2.67 seconds to beat defending champion Jenny Simpson of the United States (4:02.99) into second. Kenya's Hellen Onsando Obiri (4:03.86) was third.
American Allyson Felix got her campaign for a fourth 200m title and ninth World Championships gold under way with victory in her heat in a season's best time of 22.30 seconds.
Jamaica's Shelly-Ann Fraser-Pryce, who is bidding for a sprint double after regaining her 100m title, won her heat in 22.54.
Ivory Coast's Murielle Ahoure, who took silver in the 100m, won her heat in 22.46.