[1] Her best achievements are three individual gold medals in the short race at the IAAF World Cross Country Championships between 2002 and 2004.

She improved upon this the following year, taking the gold at the 2002 IAAF World Cross Country Championships.

Masai holds the 3000 metres African record set in July 2002 in Monaco[3] She won a bronze medal at the 2003 World Championships.

Masai herself initially rejected the offer, but joined the team after lengthy negotiations.

The previous record was held by Nicole Lévêque of France, who run 32:12.07 in Helsinki in 1994.

[6] Masai participated the 2008 World championships marathon in Osaka, Japan, finishing 8th in a race won by her compatriot Catherine Ndereba.

Masai won the 2008 Virginia Beach Rock 'n' Roll Half Marathon.

She is a divorced mother of one, her son Paul Griffin Sakit born in 1992 who ran for Louisiana Tech University.