Three-times world champion Peter Sagan has tested positive for coronavirus for the third time in 18 months and has had to abandon the Tour de Suisse. Over 40 riders have withdrawn from the race due to Covid-19 as a new wave hits Europe. The Tour de France starts on July 1. “I have no symptoms, and I feel well but I have to abandon the race,” the Slovakian wrote on Twitter. The Swiss race finishes on Sunday.