Johannes Thingnes Bø took another step towards a fifth biathlon overall World Cup title by dominating the final sprint race of the season in historic fashion on Friday in Canada while his brother Tarjei clinched the discipline title with a third-place finish. Norway’s Bø shot clean under sunny skies in Canmore to claim his sixth victory of the season and 74th overall, a massive 1 minute 2.7 seconds ahead of Italian Tommaso Giacomel who had one penalty lap. It was the largest ever winning margin in a men’s 10 kilometres sprint, the ruling body IBU said. “It was one of my best sprints, probably …