Diarra scored the goal in stoppage time to send thousands of ‘Blues’ fans at the packed Amahoro National Stadium into frenzy.
The victory ended an 11-year jinx that Rayon Sport had failed win the Peace Cup (Rwanda’s version of the FA Cup) since 2005.
The heated game saw APR coach Nizar Khafir making an early substitution, replacing Emery Bayisenge with Benedata Janvier for the holding midfield position.
Rayon midfielder Savio Nshuti Dominique caused havoc in APR’s defense as he was too hot for Michel Rusheshangoga and Herve Rugwiro to handle.
The ‘Blues’ created more chances in the first half but attempts from Pierro Kwizera, Diarra and Fabrice Mugheni were no trouble for goalie Olivier Kwizera.
Issa Bigirimana and Iranzi Jean Claude twice had their attempts saved by Rayon custodian Eric Ndayishimiye as APR resorted to counterattacks.
Both sides played cautiously in the seemingly dull second half with either of the teams’ defence opting for close marking to avoid mistakes that could otherwise prove costly.
APR duo Michel Ndahinduka and Bigirimana, will have themselves to blame for their profligacy in front of goal as they wasted several goal scoring opportunities in the second half much to the disappointment of their fans.
The deadlock was finally broken in added-on time when Kwizera spilled a Pierro goal-bound shot for Diarra who was lurking around to connect home the winner.
The victory earned Rayon Rwf. 8 million (10, 541 USD) and the ticket to represent Rwanda at next year’s CAF Confederation Cup, whilst APR pocketed Rwf 4 million (about 5, 270 USD).
Meanwhile, AS Kigali who beat Espoir 1-0 courtesy Ernest Sugira solitary strike to finish third.