Manificat captured the men's 30-kilometre race in 1 hour, 17 minutes, 47.3 seconds. Italy's Roland Clara was second in 1:17:48 and Norway's Sjur Roethe was third in 1:17:49.
Kowalczyk was timed in 42 minutes, 51.5 seconds for the 15-kilometre skiathlon. She also won the 10-kilometre race Thursday. Her fans waved Polish flags and sang the national anthem as she crossed the finish line.
Finland's Anne Kylloenen was the runner-up in 43:26.4 and Norway's Vibeke Skofterud was third in 43:26.5.