[3] ITTF World Championships 2017 Men's singles Assar competed in the 2017 World Table Tennis Championships, seeded as number 50, facing off against Italian player Marco Rech in the first round, whom he defeated in a close match (4-3), having lost the first 3 sets.

In the second round, he was defeated by Hong Kong player, and number 7 seed Wong Chun Ting (2-4).

They advanced to the third round of the tournament, before being eliminated by the Spanish team of Álvaro Robles and Galia Dvorak (1-4).

In 2017, his three-peat was interrupted by Nigerian table tennis player, Quadri Aruna, who defeated Assar in the tournament final (3-4).

2018 ITTF African-Cup Assar defeated Tunisian table tennis player Thameur Mamia (4-1) in the quarterfinals of the event.