Watching the Scottish Open and some commentator tells us that over the last year? or so, Rory has shot, on average 68.3 on Thursday but 73.7 on Friday. A huge variation given Rory's skill level. Then the commentator tells us 'there is no cause for this', just some random occurrence.
I cannot accept this 'random' notion of Rory's variation. Over many rounds, a year in competition, and this trend is cement. But random, no. However, the really interesting question is what goes on in Rory's head or body to cause such variation between two close days.
Is he tired on Friday morn, too much party? Parties late into Wednesday night so less anxious but weary on Thursday? Wants to look good to start, then loses focus on Friday? Once tourney starts, he omits sexual activities, thus is highly distracted on Friday? Overeats on Thursday night? Presumably his starts on Thur and Fri alternate between tourneys so some Thurs he starts early morn, but other tourneys he starts noon, which would balance out this source of variation.