On 25 February 2020, Lewandowski equalled Cristiano Ronaldo's record of nine away goals in a season in Europe's top club competition. He did so by scoring a goal in a 3–0 win against Chelsea at Stamford Bridge (he also assisted Serge Gnabry twice in that match). On 10 August, Lewandowski scored a brace and provided two assists in a 4–1 win over Chelsea in the return leg. On 14 August, he assisted and scored in Bayern's 8–2 decimation of Barcelona in the quarter-finals. Lewandowski scored another goal, to be 15 goals in total, in his ninth consecutive Champions League match in Bavarian's semifinal 3–0 win against Lyon. His European scoring streak ended when he failed to score a goal in the Champions League final match against Paris Saint-Germain on 23 August; nevertheless, Bayern defeated PSG 1–0, giving Lewandowski his first Champions League title. He also became the second player ever to win the European treble while being the top scorer in all three competitions, repeating Johan Cruyff's achievement with Ajax from the 1971–72 season. However, Lewandowski was the first to do so as the sole top scorer in all three competitions.