Your claim title is opinion-based in its assertion that Nadal is retiring "right on time," and therefore will be challenging to fact check. The article you linked, although from a reliable journalistic publication (New York Times), provides opinion-based commentary on the strategic value of Nadal's retirement timing, which is unlikely to be exactly corroborated by other reliable news sources. If you are seeking to fact check the claim as to whether or not Nadal is in fact retiring, you might consider changing the wording of your claim title to reflect that.