On the fourth day of the Games, Timmers competed in two events with 90 minutes in between. In the 100 m freestyle, he won the seventh heat, which included two-time Olympic champion Yannick Agnel of France. Swimming in lane eight, he blasted a new Belgian record of 48.54 to pick up a matching sixth seed with Cayman Islands' Brett Fraser from the preliminary heats. Followed by the evening session, Timmers fell short in his bid for the final, as he matched a twelfth-place finish with Australia's James Roberts in his semifinal run, outside a record time of 48.57. Timmers placed twelfth as a member of the Belgian team in the 4 × 200 m freestyle relay. Teaming with Dekoninck, Louis Croenen, and Glenn Surgeloose, Timmers anchored the race with a split of 1:48.28 to set a Belgian record of 7:14.44 in the heats.