Scheffer broke five South American records in 2018, including the long course 200 free (1:45.51) at the Porto Alegre Open in Brazil, and the 400 free short course mark (3:40.87) at the Jose Finkel Trophy competition.
2018 World Championships (Hangzhou, China)
- Won gold in the 800 freestyle medley in a world record time of 6:46.81 alongside Luiz Altamir Melo, Leonardo Coelho Santos and Breno Correia.
- Finished eighth in the 400 freestyle (3:39.40)
2018 Pan Pacific Championships (Tokyo)
- Finished fourth in the 200 free and sixth in the 400 free
- Was part of the fourth place 800 freestyle relay
2016 FINA World Championships (Windsor, Ontario, Canada)
- Finished 25th in the 200 free, 33rd in the 400 free and 40th in the 1000 free