Professional athletics career
Darlan has the Brazilian shot put record since 2012. Since then, he broke the record so often that even he knows exactly how many national records he beat. He was surpassing the mark again and again in early 2015 when he reached 20.90m.
He is the first Brazilian to qualify to the Shot Put at Olympics in 80 years - Antonio Pereira Lira was the last who did it, at the Berlin Games, in 1936.
At the 2016 Summer Olympics, in the Men's shot put, he broke the Brazilian record two times (20.94 meters in the qualifying round and 21.02 meters in the final), finishing 5th. It was the best participation of a Brazilian in the event.
In June 3, 2017, he broke the South American record once again with 21.82 during the brazilian leg of the IAAF World Challenge, São Bernardo do Campo.
In March 2018, he finished 4th place in the Indoor World Championship, with a 21.37 mark, a new indoor South American record. 
In early September 2018, representing the Americas in the IAAF Continental Cup, Darlan won gold with a 21.89 weight-shot, defeating 2017 World Champion Tom Walsh. 
On September 15, 2018 became the first South American to reach the mark of 22 m. In the Brazil Trophy, he got the exact mark of 22.00, again breaking the South American record. Fewer than 30 athletes have achieved this mark throughout the history of the event. 
At the end of 2018, he won the trophy for Best Athlete in Athletics at the Brazil Olympic Award.  He finished 5th in the world ranking of Shot Put in 2018.
On June 2019, at the Eugene stage of Diamond League, he obtained the 10th best mark (by athlete) of the History in the Shot Put, 22.61. He broke the South American record 3 times in the same event (22.46, 22.55 and 22.61). This would have given him gold in any Olympics or World Championships already held.
Shot put (outdoor): 22.61 m – Palo Alto, California, USA, 30 June 2019
Shot put (indoor): 21.37 m – Birmingham, United Kingdom, 3 March 2018
|2008||South American Youth Championships||Lima, Peru||2nd||Shot put (5 kg)||17.06 m|
|2009||South American Junior Championships||São Paulo, Brazil||2nd||Shot put (6 kg)||16.99 m|
|2010||World Junior Championships||Moncton, Canada||7th||Shot put (6 kg)||18.58 m|
|2012||Ibero-American Championships||Barquisimeto, Venezuela||3rd||Shot put||18.93 m|
|South American U23 Championships||São Paulo, Brazil||1st||Shot put||19.93 m|
|2013||South American Championships||Cartagena, Colombia||2nd||Shot put||19.64 m|
|2014||South American Games||Santiago, Chile||2nd||Shot put||19.96 m|
|Ibero-American Championships||São Paulo, Brazil||2nd||Shot put||19.64 m|
|Pan American Sports Festival||Ciudad de México, México||2nd||Shot put||20.03 m A|
|2015||South American Championships||Lima, Peru||2nd||Shot put||20.32 m|
|Pan American Games||Toronto, Canada||6th||Shot put||19.74 m|
|World Championships||Beijing, China||15th (q)||Shot put||19.86 m|
|Military World Games||Mungyeong, South Korea||1st||Shot put||20.08 m|
|2016||World Indoor Championships||Portland, United States||18th||Shot put||18.50 m (NR)|
|Ibero-American Championships||Rio de Janeiro, Brazil||1st||Shot put||19.67 m|
|Olympic Games||Rio de Janeiro, Brazil||5th||Shot put||21.02 m (NR)|
|2017||South American Championships||Asunción, Paraguay||1st||Shot put||21.02 m|
|World Championships||London, United Kingdom||15th (q)||Shot put||20.21 m|
|2018||World Indoor Championships||Birmingham, United Kingdom||4th||Shot put||21.37 m|
|South American Games||Cochabamba, Bolivia||1st||Shot put||21.21 m|
|Ibero-American Championships||Trujillo, Peru||1st||Shot put||20.74 m|
|Continental Cup||Ostrava, Czech Republic||1st||Shot put||21.89 m|
|2019||South American Championships||Lima, Peru||1st||Shot put||21.00 m|
|Pan American Games||Lima, Peru||1st||Shot put||22.07 m|