Kylian Mbappé became the youngest player with 100 Champions League appearances when he reached the century mark at age 27 in Real Madrid’s match at Roma on Wednesday. And he celebrated the mark by scoring a first-half equalizer in Madrid’s 4-3 win. Lionel Messi had set the previous record at age 28 against Roma in September 2015. Mbappé lined up at center forward in coach José Mourinho ’s starting lineup for the match at the Stadio Olimpico and his 72nd Champions League goal moved him ahead of former Madrid player Raúl González into fifth place on the competition’s career scoring list. He also...