 Complete the following phrase:  Mebarek made his official debut at the 2004 Summer Olympics in Athens, where he qualified for two swimming events. In the 400 m freestyle, he challenged seven other swimmers on the third heat, where South Koreas Park Tae-Hwan was disqualified for a false start. Mebarek edged out Slovenias Bojan Zdešar to take a fourth spot and dip under a 4-minute barrier by 0.90 of a second in 3:59.10. In his second event, 