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The emergence of green parties has injected new lines of competition into national party systems, with discernible issue competition effects for established, ideologically-proximate social democratic parties. Despite a burgeoning literature on green and social democratic issue competition tactics in settings where coalition government is common, we have less understanding of these same effects in settings where majority government is the norm. Using the case of the Australian Greens and the Australian Labor Party, we explore issue competition dynamics in a polity where the majoritarian electoral system reduces opportunities for coalition formation. We find that the absence of strong electoral imperatives for either party to enter coalitions has encouraged them to compete adjacent to one another, rather than in direct competition.