ANTONI SLODKOWSKI, ELAINE LIES and KIYOSHI TAKENAKA JAPANESE tennis star Naomi Osaka on Friday lit the Olympic cauldron to mark the formal start of Tokyo 2020, in an opening ceremony shorn of glitz and overshadowed by a pandemic but celebrated as a moment of global hope. Organisers also paid tribute to medical workers as athletes from across the world paraded into an almost empty stadium, their smiles hidden behind masks for the first time. Normally a star-studded display teeming with celebrities, the ceremony was low-key, with fewer than 1,000 people in attendance, strict social distancing rules and signs calling on…