Men to watch RAFAEL NADAL (Spain)The Mallorcan’s domination at Roland Garros since debuting in his sleeveless top and pirate pants in 2005 is quite simply unprecedented for a Grand Slam tournament. He has only lost twice on the Parisian clay in 14 years in which time his heavy topspin game has seen him bulldoze his way to a Grand Slam record 11 titles. This year, however, semi-final defeats in Monte Carlo, Madrid and Barcelona suggested the 32-year-old was not at his rampant best, perhaps struggling with nagging knee problems. But in beating world number one Novak Djokovic to the Rome title last week, his first title of the season, the reigning champion ensured that once again he will arrive at Roland Garros wearing his usual cloak of claycourt invincibility. NOVAK DJOKOVIC (Serbia)This time last year Novak Djokovic was still fighting to rediscover the spark in his game — fast forward 12 months and he could be on the verge of holding all four Grand Slams for the second time in his career. Largely because of Nadal, the French Open has proved the most challenging for the Serb and his one title came three years ago when Nadal had withdrawn with…