News The brand new Olympic Aquatics Stadium in Barra Olympic Park is sure to witness historical scenes when it hosts the swimming and water polo events at the Rio 2016 Games this August And while hosting its first competition – the Maria Lenk Trophy which doubles up as the Rio 2016 test event – it is already seeing crucial moments in Brazilian swimming history The Brazilian national championships are the last chance for the host nation's swimmers to earn places in the Brazilian swim team, and the country's golden boy of the pool, Cesar Cielo, is the man in focus While 15 swimmers won places on the Olympic team during the first three days of competition (15-17 April), Cielo – the world record holder in the 50m and 100m freestyle – saw his bid to qualify for the 100m falter on Monday (18 April) morning Become an Olympic swimming expert with our interactive infographicBrazil's only Olympic swimming champion, Cielo recorded an Olympic qualifying mark but his time (48 97 seconds) was only the seventh fastest among the Brazilians, meaning he was not even in line to make the 4x100m freestyle relay team Cielo, who won the 50m freestyle title at the Beijing 2008 Games, said he would not try to better his 100m time in the afternoon session, but rather focus his attention on the 50m event on Wednesday “All things considered, it was a good performance for me Now I will think about the 50m, which is the main focus of the season”Cesar Cielo More than 400 swimmers from 12 nations are taking part in the test event (Photo: Getty Images/Buda Mendes)The Maria Lenk Trophy runs until Wednesday (20 April) and will feature over 400 athletes – 356 Brazilians and 57 visitors from 11 countries – in all Olympic swimming events Argentina, Canada, Chile, China, Slovakia, Finland, Japan, Paraguay, Czech Republic, Ukraine and Uruguay have all sent athletes for a last chance to swim in the official competition pool for the Rio 2016 Olympic Games Joana Maranhão earned a 400m medley slot and will compete in a fourth Olympic Games (Photo: Getty Images/Buda Mendes)Check out the Brazilian qualifiers so far from the Maria Lenk Trophy: Men's events200m freestyleNicolas Nilo Oliveira – 1m46s97João de Lucca – 1m47s65100m breaststrokeJoão Gomes Junior – 59s06Felipe França – 59s36100m backstrokeGuilherme Guido – 53s10200m butterflyLeonardo de Deus – 1m55s54Kaio Márcio – 1m56s21 400m medleyBrandonn Almeida - 4m14s07 400m freestyleLuiz Altamir - 3m50s32Women's events100m butterflyDaiene Dias – 58s04Daynara de Paula – 58s38100m backstrokeEtiene Medeiros – 1m00s00200m freestyleLarissa Oliveira – 1m57s37Manuella Lyrio – 1m58s43200m medleyJoanna Maranhão - 2m14s04400m medleyJoanna Maranhão – 4m38s66