The four finals of the seventh day centred around the conclusion of the combined events. Katarina Johnson-Thompson defeated Nafi Thiam in the heptathlon with a British record score of 6981 points, which moved her up to sixth on the all-time lists. The second day of the decathlon brought surprises as world record holder Kevin Mayer dropped out and Germany's Niklas Kaul set a championship decathlon best in the javelin to help him surge from eleventh place to the gold medal, making him the youngest winner of the title at age 21. The women's 400 metres final was among the fastest ever with five women under 50 seconds for the first time at the championships – 21-year-old Salwa Eid Naser of Bahrain seized the lead early on and crossed the line in 48.14 seconds for the third fastest time ever, leaving the Olympic champion Shaunae Miller-Uibo in second place with 48.37 seconds (becoming the sixth fastest athlete ever). China's Gong Lijiao defended her women's shot put title, reaching the podium for a sixth straight championships, while silver medallist Danniel Thomas-Dodd made history as Jamaica's first woman to win a global medal in the throws.