Real Madrid have won four of the past five Champions League titles, doing so in the four years Casemiro has been at the Estadio Santiago Bernabeu.
The Brazilian was out on loan at Porto in 2014/15, the only season in the past half a decade when Los Blancos didn't win the competition and the only season when he himself has suffered elimination, as the Portuguese side lost to Bayern Munich in the quarter-finals.
As such, he has won all 12 two-legged knockout ties he has been with Real Madrid for, plus all four finals.
While he wasn't the regular starter that he is now during the 2013/14 season, he did still play an important role for Carlo Ancelotti, especially against Borussia Dortmund.
Then he played in every knockout match under Zinedine Zidane, except for the Manchester City second leg in 2015/16 when he was injured.
Against Ajax, he'll aim to keep up this impressive run.
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Perfect record of real Madrid