threevok
Double Eagle Member
I believe I've seen statistics that, in tournaments, scores in second rounds average slight worse.
Conterintuitive, but presumably a matter of physical and mental weariness. (The pace of play, and lots of standing around, make tournaments more tiring than casual rounds). Either that, or players think they've got things figured out, and take riskier lines.
I've noticed this too. I wonder what other external factors come into play though, like different course layout for the second round, more wind in the afternoon, more spectators in the afternoon, louder mariachi music during happy hour, etc.