The mixed 4 × 400 metres relay at the 2015 World Youth Championships in Athletics was held at the Estadio Olímpico Pascual Guerrero in Cali, Colombia from 18 to 19 July 2015.

Results Round 1 First 2 in each heat (Q) and the next 2 fastest (q) advance to the final. Rank Heat Nation Athletes Time Note 1 2 Keshun Reed, Symone Mason, Cory Poole, Lynna Irby 3:22.65 Q 2 3 Ryota Kitahara, Rin Aoki, Mizuki Murakami, Manato Sasaki 3:24.76 Q 3 1 Natan Fiedeń, Natalia Kaczmarek, Katarzyna Martyna, Tymoteusz Zimny 3:25.19 Q 4 3 Victoria Tachinski, Dean Ellenwood, Ebhani Blackwood, Nathan Friginette 3:25.44 Q 5 1 Rebecca Borga, Linda Olivieri, Andrea Romani, Vladimir Aceti 3:25.62 Q 6 1 Florian Colon Marti, Marvin Schlegel, Jana Reinert, Corinna Schwab 3:25.71 q 7 3 André Marich, Armouré Conradie, Taylon Bieldt, Gianni Lombard 3:26.90 q 8 3 Donovan Storr, Branson Rolle, Dreshanae Rolle, D'Nia Freeman 3:28.24 9 3 Michael Bentley, Anthony Carpenter, Janiel Moore, Satanya Wright 3:28.71 10 2 Nicolae Daroczi, Cristina Bălan, Andrea Miklós, Florin Gaspar 3:29.40 Q 11 2 Ánna Kiáfa, Yeóryios Kaloyerákis, Alexía Polikráti, Mihaíl Pappás 3:30.56 12 3 Manuel Guijarro, Andrea Serrano, Ruth Peña, Álvaro Sierra 3:32.14 13 1 Mathias Hove Johansen, Toralv Opsal, Kristine Berger, Mari Drabløs 3:32.95 14 2 Sarah Richard, Sarah Koutouan, Thierry-Orden Dagbetin, Wilfried Happio 3:34.74 15 3 Fanny Estupiñán, Sebastian Acuña, Tania Caicedo, Franco Loja 3:34.98 2 Christopher Melenciano, Luis Charles, Maria Matos, Lilian Reyes 1 Anjelika Belova, Elmira Gazizova, Shokhrukh Baratov, Zhalolitdin Khamrokulov 1 Rodrigo Lagares, Marisofía Pinilla, Jarly Marín, Anthony Zambrano 1 Huang Jiaxin, Liang Nuo, Wu Yuang, Xu Haoran 2 Esam Al-Hamrani, Fatuma Chebsi, Abdulrahman Ashreen, Salwa Eid Naser 2 3

Final

Rank Nation Athletes Time Note Keshun Reed, Lynna Irby, Norman Grimes, Samantha Watson 3:19.54 André Marich, Renate van Tonder, Taylon Bieldt, Kyle Appel 3:23.60 Nathan Friginette, Ashlan Best, Dean Ellenwood, Kyra Constantine 3:23.60 4 Florian Colon Marti, Corinna Schwab, Lea Ahrens, Marvin Schlegel 3:24.50 5 Natan Fiedeń, Natalia Kaczmarek, Katarzyna Martyna, Tymoteusz Zimny 3:24.64 6 Ryota Kitahara, Rin Aoki, Mizuki Murakami, Manato Sasaki 3:25.01 7 Ilaria Verderio, Linda Olivieri, Andrea Romani, Vladimir Aceti 3:25.29 8 Nicolae Daroczi, Cristina Bălan, Andrea Miklós, Florin Gaspar 3:31.94

References