 Although his performance against New Zealand in the third round of the 2017 Rugby Championship was highly criticised, Marx performed to a world-class level throughout most of the competition and played in every test of the competition, with South Africa finishing in third place.Marx was not subbed off in either test against Australia during the competition, a rare feat for a hooker, the first test of which a 23-23 draw and the second test against Australia being a 27-27 draw.Marx lost out on winning Man of the Match to Australian back Kurtley Beale on both occasions.