TOKYO — Canada threatened to add to its medal total Tuesday at the Tokyo Olympics but, despite a few close calls, the nation was left without any hardware to celebrate for the second straight day. Once again, however, Canadian athletes set themselves up for success in the coming days. Sprinters Andre De Grasse and Aaron Brown both won their semifinal heats in the men's 200 metres. De Grasse cruised into Wednesday's 200 final with a Canadian-record time of 19.73 in his semifinal. The 26-year-old