American Matthew James Klotz produced a sizzling time of 2min 01.96sec to win the men's 200 metres backstroke at the Atakum Olympic Swimming Pool.

The 21-year-old obliterated a strong field to finish over 5sec clear of Japanese silver medal winner Yoshikazu Kanaji.

He clocked 2:07.77 for second place as Poland's Juliusz Sawka managed 2:08.30 for bronze.

Klotz also won two golds and a bronze medal at the Sofia 2013 Deaflympics.

Olga Kliuchnikova of Russia then proved similiarly dominant with a record mark in the 200m individual medley. 

Her time of 2:19.35 put her 4sec clear of team-mate Polina Bilalova, second in 2:23.41, and Ukraine's Iryna Tereshchenko, third in 2:27.22.

Britain's Danielle Joyce was among the day's other winners.

She clocked 26.382 to win the women's 50m freestyle.

Eleonara Vyach Brykanova of Russia was second in 26.54 while Ukraine's Mariya Rezhylo took bronze, a further 0.23 back.

Other Russian winners today came in Greco Roman wrestling, where Martin Aleksanov beat Georgian opponent Lasha Janelidze to claim under 66 kilogram spoils.

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.