Twice Olympic champion Shaunae Miller-Uibo pulled up during the heats for the Paris 400 metres and failed to finish on Monday, meaning she missed a second chance in the new repechage. The 30-year-old Rio and Tokyo champion from the Bahamas, who had fitness concerns heading into the Games, managed just 200m before not being able to continue. World champion Marileidy Paulino of the Dominican Republic was quickest in qualifying for Wednesday’s semi-finals with 49.42 seconds. Paulino shrugged off Miller-Uibo’s woes. “For me, my strongest rival is the time. I have worked so hard and I believe in my…