French Open chief Amelie Mauresmo has admitted they’ve had to cancel a farewell ceremony planned for Rafael Nadal. Nadal is currently in Paris preparing for his clash with Alexander Zverev, with the two men poised to lock horns on Monday. Nadal has long suggested he’ll retire this year, having been plagued by injury issues in recent years. Earlier this weekend, however, the 37-year-old suggested he could yet play on. “In some ways I don’t want to close 100 per cent the door,” he said. “Physically I feel better, I am improving in different ways and I have less limitations than three or four wee…