Briton Thomas Pidcock overcame a puncture and a final attack from French rival Victor Koretzky to claim back-to-back Olympic gold in mountainbike cycling at the Paris Games on Monday. Pidcock fought back from around 40 seconds down after needing a new front wheel midway through the race and then battled with long-time leader Koretzky and South African Alan Hatherly. Koretzky attacked in the eighth and final lap at Colline d’Elancourt in a bid to emulate countrywoman Pauline Ferrand Prevot’s triumph the previous day. But Pidcock closed the gap and then robustly took the lead after going around …