イタリアダービー
Ronaldo won his first trophy with the club on 16 January 2019, the 2018 Supercoppa Italiana, after he scored the game-winning and only goal from a header against Milan. On 10 February, Ronaldo scored in a 3–0 away win over Sassuolo; the ninth consecutive away game in which he had scored for Juventus in the league, which enabled him to equal Giuseppe Signori's single season Serie A record of most consecutive away games with at least one goal. On 12 March, Ronaldo scored a hat-trick in a 3–0 home win against Atlético Madrid in the second leg of the Champions League round of 16, helping Juventus overcome a two-goal deficit to reach the quarter-finals. The following month, Ronaldo scored his 125th goal in the competition, opening the scoring in a 1–1 away draw in the first leg of Juventus' quarter-final against Ajax, on 10 April. In the second leg in Turin on 16 April, he scored the opening goal of the match in the first half, but Juventus eventually lost the match 2–1, and were eliminated from the competition. On 20 April, Ronaldo played in the "scudetto" clinching game against Fiorentina, as Juventus won their eighth successive Serie A title after a 2–1 home win, thereby becoming the first player to win league titles in England, Spain, and Italy. On 27 April, he scored his 600th club goal, the equaliser in a 1–1 away draw against "Derby d'Italia" rivals Inter Milan. Finishing his first Serie A campaign with 21 goals and 8 assists, Ronaldo won the inaugural Serie A award for Most Valuable Player.