mnshiner:
How did this person play 3 different tiers in the same day?
They signed up for the January Multi-round as an amateur (on or before Jan 6th), so they're competing in that tier for the entire tournament (4 rounds).
I suspect they advanced from Pro to Tour Pro after shooting the 60 in the Pro Tier Open, so the next tourney they entered (Best of Hardest Front 9) was from their new tier of Tour Pro.
Hard to imagine someone shooting an 89 for 9 holes and then following it up with a 60 for 18 though. I guess they must have had some sort of epiphany regarding scoring well. I mean, it's the only logical explanation, isn't it?