Which of the following is not correctly matched?

The correct answer is John Updike: “The Swan”.

To understand why this is the incorrectly matched pair, we can analyze the authorship of each literary work:
• Seamus Heaney: “Digging” is correctly matched. “Digging” is one of the most famous poems by the Nobel Prize-winning Irish poet Seamus Heaney, serving as the opening poem of his debut collection, Death of a Naturalist (1966).
• Audre Lorde: “Coal” is correctly matched. “Coal” is a celebrated and widely anthologized poem by the American writer, feminist, and civil rights activist Audre Lorde, published in her landmark 1976 collection of the same title.
• Dom Moraes: “Kanheri Caves” is correctly matched. It is a well-known poem by the prominent Indian English poet and writer Dom Moraes, reflecting on the ancient Buddhist rock-cut monuments near Mumbai.
• John Updike: “The Swan” is incorrectly matched. While John Updike was a highly prolific American novelist and poet, he is not the author of the well-known poem titled “The Swan.” That poem was written by the acclaimed American poet Mary Oliver (another famous poem titled "The Swan" / "Der Schwan" was written by Rainer Maria Rilke).