[1] He represented his nation Qatar in two editions of the Olympic Games (2000 and 2004), and also acquired a personal best of 8.13 metres in the long jump to top the prelims at the 2003 Asian Athletics Championships in Manila, Philippines.

Al-Nubi made his official debut at the 2000 Summer Olympics in Sydney, where he failed to record a legal distance upon committing a foul in each of his three successive attempts during the prelims of the men's long jump.

[3] At the 2004 Summer Olympics in Athens, Al-Nubi qualified for his second Qatari squad, as a 24-year-old, in the men's long jump, by spanning a Qatari record-breaking leap of 8.13 m to snare an Olympic B-standard from the Asian Championships in Manila, Philippines one year earlier.

[2][4] Unlike his previous Olympic feat, Al-Nubi started with a clear foul, but quickly redeemed himself to touch the ground at a satisfying leap of 7.41 m on his second attempt.

Since his third jump was slightly shorter than his best by a 15 cm deficit, Al-Nubi wound up to thirty-seventh spot in a field of forty-one athletes, and did not advance past the qualifying round.