Career
Youth
Border Bulldogs
He was one of several amateur club players brought into the Border Bulldogs provincial set-up at the start of 2014 after the professional side was declared bankrupt. He was included in their squad for the 2014 Vodacom Cup competition and made his debut in their opening match against a Sharks XV. Border lost the match 24–46, but Mapimpi marked his first class debut with a try shortly after half-time. He also started the remaining four matches in the competition, scoring his third try of the campaign in their match against the SWD Eagles, as the Border Bulldogs finished bottom of the log.
He missed their next match against the Boland Cavaliers, before starting their other four matches in the competition.
Mapimpi once again started all five of their matches, including their first match against the Falcons, which turned out to be the Border Bulldogs" only victory of the season as they ran out 19–14 winners. Mapimpi returned in the 2015 Vodacom Cup, but ended up on the losing side in their first six matches in the seven-match competition.
Mapimpi was the star performer in their final match of the season against the Boland Cavaliers in Alice. He scored a hat-trick of tries and, with regular kicker Coyi Banda unavailable for this match, also took over the kicking duties and slotted three conversions and a penalty.
He finished the match with a personal haul of 24 points in the Border Bulldogs" 29–5 victory to help them overtake the Boland Cavaliers on the Southern Section log.