Mori's best finish at the FIS Nordic World Ski Championships was sixth in the 7.5 km sprint event at Ramsau in 1999. His best World Cup finish was second in a 15 km individual event in Poland in 1999, which was one of his three best career finishes. Mori also earned two second-place finishes in World Cup B 15 km individual events (1994, 1997).