Antonyms for the phrase "closes the deal" might include phrases like "fails to persuade," "loses the sale," or "misses the opportunity." These antonyms describe a situation in which a person or team is unable to seal the deal and bring a negotiation or business transaction to a successful conclusion. Other possible antonyms might include phrases like "opens the door to negotiation" or "sows the seeds of doubt," which describe actions that set the stage for further discussion or create obstacles to successful closing. Whatever antonym is chosen, it serves to underline how important it is to be able to finalize deals and create successful business relationships.