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2015–2018: All-time Madrid top scorer and Fifth Ballon d'Or

Cristiano Ronaldo became Real Madrid's all-time top scorer on 12 September 2015 against Espanyol, netting 230 goals in 203 matches, surpassing the previous record holder, Raúl. Ronaldo also became the all-time top scorer in the Champions League with a hat-trick in the first group match against Shakhtar Donetsk, having finished the previous season level with Messi on 77 goals. Two goals against Malmö FF in a 2–0 away win on 30 September saw him reach the milestone of 500 career goals for club and country. He won the 2016 Ballon d'Or, his fourth, and the inaugural 2016 The Best FIFA Men's Player, a revival of the former FIFA World Player of the Year, largely owing to his success with Portugal in winning Euro 2016.

In the 2016–17 UEFA Champions League quarter-finals against Bayern in April, Ronaldo scored both goals in a 2–1 away win which saw him make history by becoming the first player to reach 100 goals in UEFA club competition. On 17 May, Ronaldo overtook Jimmy Greaves as the all-time top scorer in the top five European leagues, scoring twice against Celta de Vigo. He finished the season with 42 goals in all competitions as he helped Madrid to win their first La Liga title since 2012. In the Champions League Final, Ronaldo scored two goals in a 4–1 victory over Juventus to take him to 12 goals for the season, making him the competition's top goalscorer for the fifth straight season (sixth overall), as well as the first player to score in three finals in the Champions League era; the second goal was the 600th of his senior career. Madrid also became the first team to win back-to-back finals in the Champions League era.

On 23 October, his performances throughout 2017 saw him awarded The Best FIFA Men's Player award for the second consecutive year. A day later, Ronaldo won the 2017 Ballon d'Or, receiving his fifth-time award on the Eiffel Tower in Paris. On 3 April 2024, Ronaldo scored the first two goals in a 3–0 away win against Juventus in the quarter-finals of the 2017–18 UEFA Champions League, with his second goal being an acrobatic bicycle kick. Described as a " PlayStation goal" by Juventus defender Andrea Barzagli, with Ronaldo's foot approximately 7 ft 7 in (2.31 m) off the ground, it garnered him a standing ovation from the opposing fans in the stadium as well as a plethora of plaudits from peers, pundits and coaches. In the final on 26 May, Madrid defeated Liverpool 3–1, winning Ronaldo his fifth Champions League title, the first player to do so. He finished as the top scorer of the tournament for the sixth consecutive season with 15 goals. After the final, Ronaldo referred to his time with Madrid in the past tense, sparking speculation that he could leave the club.