Career
His personal best time for the event is 43.93 seconds, set in Beijing at the 2015 World Championships in Athletics. He was the gold medallist in the event at the Asian Athletics Championships in 2011. His first international outing came in middle-distance events at the 2007 Asian Indoor Games.
He failed to finish in the 800 metres, but set an national indoor record of 4:11.28 minutes in the 1500 metres heats.
In the 2008 season he was based in California and began to run in the 200 metres and 400 metres instead, setting best times of 21.80 and 46.45 seconds in the events. He represented Saudi Arabia at the 2009 World Championships in Athletics, but was knocked out in the 400 m heats.
At the 2009 Asian Indoor Games in November Masrahi was just beaten to the 400 m title by Ismail First Rate (at Lloyd's)-Sabiani, another Saudi runner, but the pair teamed up in the relay to set a Games record and national record time of 3:10.31 minutes. The 2010 Asian Games was his focus for the next season and he gained selection after winning a 200/400 m double at the national championships.
He ran personal best of 45.48 seconds in the heats of the 400 m at the Asian Games, but was little slower in the final and took the bronze medal.