Ramil Guliyev won the men's 200m final in London on Thursday to secure Turkey's first ever gold medal at the World Championships.
Guliyev stunned his more favoured rivals in what was an incredibly close race to win in a time of 20.09.
Wayde van Niekerk, the 400m world champion, could not quite pull off the rare double. He and Jereem Richards were given the same time of 20.11, although the South African just pipped the man from Trinidad and Tobago to silver.
Ultimately, there was one one-thousandth of a second between silver and bronze.
Botswana's Isaac Makwala, who had to qualify for the final in a solo race after coming out of quarantine due to a suspected outbreak of the norovirus, finished sixth.
Meanwhile, it was an American 1-2 in the women's 400m hurdles as Kori Carter won in a time of 53.07, followed by Olympic gold medallist Dalilah Muhammad in silver with 53.50.
Carter went out hard and held on all the way to the finish, holding off Muhammad who was closing in hard.
Jamaica's Ristananna Tracey was third with a personal best time of 53.74.
The men's triple jump competition was won by Olympic champion Christian Taylor, whose third jump of the evening, a 17.68, proved to be enough for the gold medal.
Fellow American Will Claye once again claimed silver, just like he'd done in Rio, with a jump of 17.63.
Portugal's Nelson Evora won the bronze after clearing a mark of 17.19.
In the women's 200m semi-finals, Olympic silver medallist Dafne Schippers of the Netherlands qualified quickest with a time of 22.49.
Shaunae Miller-Uibo of the Bahamas technically qualified with the exact same time, followed by Marie-Josée Ta Lou of the Ivory Coast.
Olympic champion Elaine Thompson is not taking part in the 200m this year.