 Complete the following phrase:  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 Germanys 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 