Lyon put up more of a fight in the second half but have now lost three on the spin in all competitions following back-to-back defeats against Glasgow Warriors in the European Champions Cup.
The try of the game however belonged to Messam. The former All Black followed up a Francois Trinh-Duc penalty in the second minute of the game. The ball bounced off the crossbar and into his hands and the former All Black backrow, who scored.
Watch the Heineken Champions Cup Final live on RugbyPass throughout Asia and Australia.