Rozanov's success followed the time trial gold and points silver medals that he won at the 2013 edition in Sofia.

The 28-year-old produced a superb performance to win the 50 kilometres race against the clock in 1 hour 07min 55.60sec.

Adrian Babic of Slovakia finished in a distant second place in 1:10:40.50.

It proved a momentary blip to Russian domination, though, as Ivan Vladimirovich Makarov took bronze in 1:11:06.30.

The world's largest country also enjoyed victory in the corresponding women's race, with Bondareva triumphing over the 35km course in 48:37.921.

Ludy Nava Correa took Venezuelan silver in 49:21.322 while the final place on the podium was taken by Yukari Minohara of Japan.

She managed 49:54.123 for bronze.

Russian swimmers also enjoyed success today as competition began at the Atakum Olympic Swimming Pool.

This included a world record for Viktoriia Terenteva in the women's 200 metres freestyle.

The 18-year-old clocked 2:04.64 to obliterate the field.

Hu Yuchen of China finished over 5sec behind when touching in 2:09.83 for second. 

Bronze was taken by Mariya Rezhylo of Ukraine in 2:10.16.

More than 3,000 athletes from 97 countries are taking part at the premier event for deaf athletes in the Black Sea city.

They are competing in 20 sports - athletics, badminton, basketball, beach volleyball, bowling, road cycling, football, golf, handball, judo, karate, mountain bike, orienteering, shooting, swimming, table tennis, taekwondo, tennis, volleyball and wrestling.