In 2018, Naser competed at seven 400 m Diamond League events, winning six of them and achieving also six marks below 50 seconds. On 30 June, at the Paris Meeting, she won with a new lifetime best of 49.55 s, breaking an Asian record set in 1993 by Ma Yuqin with 49.81 s. On 20 July, at the Herculis meet in Monaco, she greatly improved her PB in a time of 49.08 s to finish second just behind Shaunae Miller-Uibo, who set the circuit record with her result 48.97. It was the fastest women’s 400 m race run since 2009, and also the first since 1996 in which two women went below 49.10 s. In August, Naser won the race at the Asian Games in Jakarta. On 30 August, she also won the 4x100 m relay final and went on to take silver in the 4x400 m relay. She flew to Brussels later that night and won the 400m Diamond League title just hours later in 49.33 s. A few days later, the sprinter won also Continental Cup held in Ostrava running 49.32 s. In 2018 in total, she won 10 of her 11 400 m races and recorded 7 sub-50-second clockings.