Makazole Mapimpi scored a hat-trick as South Africa rounded off their Rugby World Cup preparations with a resounding 41-7 win over Japan in Kumagaya on Friday.

Japan stunned the Springboks at the World Cup in England four years ago but there was no chance of a repeat as Rassie Erasmus' side surged to a commanding victory that maintained their unbeaten record in 2019.

Cheslin Kolbe opened the scoring in the corner before Mapimpi got off the mark following some excellent work from Willie le Roux, who plucked down a high ball and shook off his marker to send the wing through.

Despite Japan enjoying plenty of possession, the Springboks took a 22-0 lead into half-time when Handre Pollard added a penalty to a routine second from Mapimpi.

Mapimpi showed incredible pace when he motored away with Pieter-Steph du Toit's pass to complete his hat-trick, but Kotaro Matsushima – born in Pretoria – pulled one back to the delight of the home support.

South Africa finished the match a man light due to Francois Louw being sent to the sin bin following repeated team infringements, but Kolbe charged home from inside his own 22 and Herschel Jantjies scored his fourth try in as many Tests to send the Rugby Championship winners into the World Cup full of confidence.