His best finish at the FIS Nordic World Ski Championships was eighth in the 50 km event at Oberstdorf in 1987 .
Walder finished third in the 30 km class of the national men 's championships of cross-country skiing .
Walder 's best finish at the FIS Nordic World Ski Championships was eighth in the 50 km event at Oberstdorf in 1987 .
Walder finished third in the 30 km class of the national men 's championships of cross-country skiing .