Norway’s Johannes Hösflot Kläbo attacked at the last short uphill to remain perfect in the Tour de Ski after four stages and claim a record 15th stage win overall at the prestigious cross country event on Wednesday in Germany. Kläbo let his rivals catch up early on before sprinting away from a large leader group in the closing stages to win a 20-kilometres freestyle pursuit in Oberstdorf, after also dominating the first three stages. Compatriot Sindre Björnestad Skar trailed by 1.8 seconds in second. Italy’s Federico Pellegrino, formerly only a sprint specialist, was another three-tenth back i…