Mezue ahịrịokwu na-esonụ: N'asọmpi Diamond League na Paris na 6 Julaị 2012, Greene gbara ọsọ kachasị mma nke 47.84 sekọnd na-emechi Javier Culson nke abụọ iji bịaruo nso na ndekọ ndị Britain na 400m hurdles. A họpụtara Greene ka ọ bụrụ onye isi ndị egwuregwu egwuregwu Britain maka egwuregwu Olympic nke London nke 2012, dịka otu n'ime ndị ọkacha mmasị maka nrite. Na agba nke mbụ nke 400 m ihe mgbochi Greene meriri okpomọkụ ya na 48.98s, oge kachasị ọsọ nke agba. Na ọkara-ikpeazụ Greene gbara ọsọ nwayọ, na-agwụ nke anọ ma na-eru eru maka ikpeazụ dị ka onye na-efunahụ ngwa ngwa. N'ikpeazụ, Greene bịara nke anọ n'azụ onye mmeri Olympic nke 2004 bụ Félix Sánchez, ihe ijuanya American Michael Tinsley na Javier Culson, na-agba ọsọ nwayọ karịa ka ọ nwere na ọkara ikpeazụ. Mgbe ọ gbasịrị ọsọ ahụ, Greene kwetara na o wutere ya nke ukwuu, ma kwuo na ọ bụ nkwụsị nke ọzụzụ ya kpatara site na mmerụ ahụ ikpere ya n'oge oyi. Greene gbakwara ọsọ n'asọmpi ikpeazụ nke
4 × 400 metres relay, dịka ndị otu Briten kwụsịrị nke anọ, naanị 0.13 sekọnd site na nrite.