Doris Jacob (born 16 December 1981, age 44) is a Nigerian sprinter who specializes in the 400 metres.
Duah finished seventh in 4 x 400 metres relay at the 1997 World Championships, together with teammates Olabisi Afolabi, Fatima Yusuf and Falilat Ogunkoya. Participating in this event at the 2000 Summer Olympics, the team with Jacob, Afolabi, Rosemary Okafor and Charity Opara set a national record of 3:22.99 minutes in their heat. Jacob also helped win a bronze medal at the 2002 Commonwealth Games.
On the individual level, Jacob won a silver medal at the 2003 All-Africa Games and a bronze medal at the 1999 Summer Universiade, the latter in a personal best time of 51.04 seconds.
Achievements Representing 1997World ChampionshipsAthens, Greece7th4 × 400 m relay3:30.041999UniversiadePalma de Mallorca, Spain3rd400 m51.042000Olympic GamesSydney, Australia1st (h)4 × 400 m relay3:22.992001UniversiadeBeijing, China8th4 × 400 m relay3:48.922002Commonwealth GamesManchester, United Kingdom13th (sf)400 m52.883rd4 × 400 m relay3:29.16African ChampionshipsRadès, Tunisia8th (h)400 m54.142003All-Africa GamesAbuja, Nigeria2nd400 m51.41Afro-Asian GamesHyderabad, India2nd400 m53.08
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