Jan Serfontein ran in two tries, while Nico Janse van Rensburg, Timoci Nagusa and Louis Picamoles all crossed in the second half as Vern Cotter's men cantered past their nearest rivals and made it 10 league wins from 10 on home soil this term.

The only negative for Montpellier came when Nagusa suffered an apparent knee injury in the act of scoring his side's fourth try.

Racing would have replaced its opponent as Top 14 leader with a victory at Altrad Stadium, but was ultimately outclassed.

A moment of magic from Serfontein produced the only touchdown of the first half, the South Africa centre skilfully chipping over the top of the Racing defence before collecting his own kick to score.

Montpellier led 13-3 at the interval, Ruan Pienaar adding a conversion and two penalties prior to a solitary three-pointer from Pat Lambie, before effectively wrapping up victory with two tries in the first five minutes of the second period.

Martin Devergie's superb offload sent Janse van Rensburg clear down the right wing and Serfontein crashed over from first receiver, with Pienaar converting both touchdowns.

Racing was unable to hit back even when home prop Jannie du Plessis was yellow-carded and late tries from Nagusa and Louis Picamoles rounded off a superb afternoon for Montpellier.