During the 2018 Rugby Championship, Cheika faced severe criticism over the team's form and a string of poor results. His job was openly questioned in the Australian media after the team won only two games during the Championship. Despite leading New Zealand 6–5 in the opening match, the Wallabies went onto lose the match 38–13, and despite being marginally behind the All Blacks in the second test, 7–14 at half time, they also went on to lose that match 40–12. Cheika's side did manage an impressive 23–18 victory over South Africa to retain the Mandela Challenge Plate. However, the following week, Australia lost to Argentina 23–19, which was the first time since 1983 that Argentina had beaten Australia on home soil. This meant the Wallabies dropped to a record low seventh place on the World Rugby Rankings and, after Round 5, their woes continued as they lost to South Africa 23–12. In the final round, Argentina led Australia 31–7 at half time in Salta. However a record come-back in the second half meant Cheika and his team won 45–34, to secure third place in the Championship. In the third Bledisloe Cup match, held in Japan, the Wallabies put on a better performance but failed to capitalise on their chances, seeing the All Blacks win 37–20.