On 2 December, Klose scored his ninth goal of the season, securing a 2–1 victory over Parma, lifting Lazio into fourth place in Serie A. Two weeks later, on 15 December, he scored a late goal to send his side to a 1–0 victory over second-placed Internazionale, reducing the gap between the two sides in the league table to one point. On 5 May 2013, he scored five goals against Bologna before being substituted for Louis Saha in the 68th minute. It was the first time since the 1984–85 season that a player scored five goals in the same game in Serie A.