Gemma Gibbons delivered Great Britain's first Olympic Judo medal in 12 years with a silver after losing to Harrison.
Gibbons caught the attention of the ExCeL crowd as she battled through to the semi-finals and then disposed of world champion Audrey Tcheumeo with an Ippon throw in golden score.
Tcheumeo picked herself up to win the bronze-medal fight against Abigel Joo of Hungary.
Top-seeded Brazilian Mayra Aguiar also made the podium when she beat Marhinde Verkerk on an Ippon score.
The gold proved just out of reach for the 25-year-old Gibbons as the fourth-seeded Harrison claimed a narrow 2-0 victory.
In the men's contest, Khaibulaev of Russia defeated Mongolian Tuvshinbayar Naidan to claim gold.
A bronze medal went to Henk Grol, the number two seed from the Netherlands. Defeated semi-finalist, German Dimitri Peters, also won bronze.