The 400 final is on Tuesday.
"I learn every day".
"The camp was really daunting, and I really wanted to bring that spark back", McLeod, the Olympic champion who led from hurdle one and clocked 13.04 seconds, told media in London.
As her running career has progressed, Jenny Simpson often has cited the wisdom she has gained as a critical component of her ongoing success.
Also to look out for in the final is the U.S. champion Jenny Simpson, who came through strongly on the home straight to take third spot in Hassan's semi.
After a chaotic and thrilling final 100 meters, Kipyegon emerged the victor in 4:02.59.
In one the most highly anticipated head-to-heads of these championships, Venezuela's Yulimar Rojas claimed triple jump gold ahead of South American rival Caterine Ibarguen.
Defending world champion Genzebe Dibaba finished 12th and last, more than 4sec off the winning pace.
And the reigning champion kept everyone at bay Monday in the women's 1,500-meter finals at the World Championships. She won gold in this event at the 2011 world championships in Daegu before earning a silver medal in Moscow three years later.
It extended her winning streak to 41 competitions.
Silver went to Zheng Wang of China with 75.94 and bronze to Malwina Kopron of Poland with 74.76.
Van Niekerk got a shot in the arm in his pursuit of the golden double after Botswana's dangerman Isaac Makwala pulled out of the 200m heats due to food poisoning. Those other things are issues I don't focus on.
Semenya made world-wide headlines as a 19-year-old when she won the 2009 world title with reports afterwards claiming tests had revealed her body produced an abnormally high amount of testosterone.
LAURA MUIR insisted she had not deviated from her race plan after missing out on a medal in the 1500metres in London last night.
The IAAF paid tribute to Australian great Betty Cuthbert before the start of action at the world championships.
Simpson assumed pole position behind Hassan and Kipyegon, who hit full throttle out front with 300 meters left, leaving Simpson to battle with Muir and Semenya for the minor medals.
And she has some big goals, too.
Cuthbert won the 100 and 200 at the 1956 Melbourne Olympics when she was 18.
The rules were overturned in time for last year's Olympics, where Semenya won gold.
Minutes earlier, Olympic champion Omar McLeod had given Jamaica its first gold medal of these championships as he powered to 110m hurdles gold. Neither 2008 Olympic champion LaShawn Merritt nor 2012 Olympic champion Kirani James is in the 400m final.
The 26-year-old from Blackburn struggled to hold back the tears afterwards, her personal disappointment also bad news for a team that have already seen medal hopes Katarina Johnson-Thompson, Holly Bleasdale and Andy Pozzi miss out.
He will face Olympic champion Omar McLeod of Jamaica and defending champion Sergey Shubenkov of Russian Federation.
Meanwhile, Sophie Hitchon could only finish seventh in the hammer final in London on Monday.