Real Madrid scored four first-half goals to cruise past Viktoria Plzen and go top of Champions League Group G.
Karim Benzema opened the scoring with his 200th club goal before Casemiro doubled the visitors' advantage.
Benzema headed a second from close range before Gareth Bale rounded off the half with a left-footed strike.
Madrid were dominate throughout and Toni Kroos added an impressive fifth after the interval when he chipped goalkeeper from inside the area.
Victory for the holders was new manager Santiago Solari's third consecutive win since taking charge, after Julen Lopetegui was sacked last month.
The La Liga side can qualify for the knockout stages with a draw against Roma in their next game, should CSKA Moscow fail to beat Plzen.