Education
He competed in the 2010 Pan Pacific Swimming Championships in Irvine, where he finished 9th in the 200-metre butterfly, and 11th in the 200-metre backstroke. He also participated in the 2010 FINA World Swimming Championships (25 m), in Dubai, where he finished 28th in the 100-metre backstroke and 15th in the 200-metre butterfly.
Career
2010-2012
In 2010, Deus joined the Brazilian national delegation and participated in the 2010 South American Games in Medellin. He qualified for the semifinals of the 200-metre butterfly with the second fastest time (1:5555) at the 2011 World Aquatics Championships in Shanghai, finishing 13th in the semifinal. He also qualified for semifinals of the 200-metre backstroke, finishing 15th.
Leonardo was disqualified after the game, but after protests from fans and the athletes themselves, the gold medal was returned to him.
2012 Summer Olympics
At the 2012 Summer Olympics, he qualified for the semifinal of the Men"s 200-metre backstroke, finishing in 16th place overall in the heats, and seventh in his semifinal, failing to qualify for the final. He finished 13th in the 200-metre backstroke.
He also came in 21st place in the 200-metre butterfly. 2013–current
At the 2013 World Aquatics Championships in Barcelona, Deus finished in 7th place of his first classification to a World Championship final, the 200-metre butterfly final, with a time of 1:56.06.
He participated in the 200-metre backstroke, finishing 12th.
He also participated in the 4×100-metre medley, finishing 12th, along with Marcelo Chierighini, Felipe Lima and Nicholas Santos. At the 2014 Maria Lenk Trophy in São Paulo Paulo, Deus broke the Brazilian record in 400-metre freestyle with a time of 3:50.90, improving Armando Negreiros"s time from 1997 by twenty-eight hundredths of a second. In May 2014, at the Brazilian Junior and Senior Swimming Championships, he broke the Brazilian record again with a time of 3:50.71.
He also finished 6th in the 200-metre backstroke and 12th in the 400-metre freestyle heats.
At the Brazilian Open, in Rio de Janeiro, he broke, for the third time, the Brazilian record in the 400-metre freestyle, with a time of 3:50.37. In April 2015, at the Maria Lenk Trophy, in Rio de Janeiro, he broke the South American record in the 400-metre freestyle, with a time of 3:49.62, and swam lifetime best in the 200-metre butterfly, with a time of 1:55.19, earning the best time of the year in the event.
At the 2015 World Aquatics Championships in Kazan, de Deus din"t swim well in the Men"s 200 metre butterfly.