Next Monday will see him drop the first 10 of 46 points from 4 counters ( of his current 119 points total ) due to drop off in the next month or so.
Week to week rankings defences are no great priority, particularly, at his age, but be good if he can recover these points over the rest of the year along with some encouraging performances
It's the interesting thing about sport in general and tennis in particular.
Mark Whitehouse might have a brain the size of a planet (Imperial college, masters, 'n' all that) but he doesn't half tighten up just at key moments, much as he must 'know' that that's precisely what not to do, and what his opponent is relying on....