With the clay and grass season doing their periodic rejig back about a week ( to avoid them eventually happening in March and April ! ) Monte Carlo et all are a week later than last year so the big tournament points from last year will be coming off a week before their replacements go on - eg. Andy's 360 Monte Carlo points off on 17/04.
With Wimbledon also so recently having gone back a week compared to Roland Garros it is going to seem very late this year starting on 3rd July.
