Two-time world champion Evgenia Medvedeva took the lead at the NHK Trophy after Friday's short program.
Performing to Adios Nonino by Argentine composer Astor Piazzolla, Voronov pulled off a quad-triple toe, a triple Lutz and triple Axel to score a season's best of 90.06 points at the Osaka Municipal Central Gymnasium.
Medvedeva won the Rostelecom Cup at home in Russian Federation last month and is in Osaka looking to earn a place at next month's Grand Prix Final in Nagoya, Japan.
Earlier this year, her devotion to Japanese anime was well illustrated during a performance in Niigata Prefecture, where she skated in an outfit of cartoon hero 'Sailor Moon.' After the event she was greeted by Naoko Takeuchi, an artist and author of 'Pretty Guardian Sailor Moon, ' who presented Medvedeva with a hand-drawn picture.
The Skate Canada International silver medallist stepped out of the landing on his triple Axel and reduced his combination to a triple flip-double toeloop.
"Unfortunately, they have made their final decision that I should not take part". "But mistakes happen and show you where work is needed".
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Voronov added a first place in Saturday's free skate to his win in Friday's short program to cruise to victory with 271.12 points.
Israel's Alexei Bychenko sits in second place with 85.52 points and United States' Jason Brown third with 85.36.
World champions Wenjing Sui and Cong Han of China won the gold medal in pairs with 234.53.
Russia's Olympic silver medallists Ksenia Stolbova/Fedor Klimov came second while their teammates Kristina Astakhova/Alexei Rogonov placed the third.
Three-time and reigning world champions Tessa Virtue and Scott Moir, who won their seventh Skate Canada title last month with a record score, were first after the ice dance short program with 80.92. "It certainly was a step forward in a lot of the elements and we are pleased with the attack that we had and with our technical proficiency".
The NHK Trophy is the fourth of the six events of the ISU Grand Prix of Figure Skating series 2017/18.