Nobody had FluFrx circled, and that's exactly the problem for everyone else. 10 upsets over higher-seeded opponents later, FluFrx has gone from afterthought to the team nobody wants to draw.
Underdog runs live and die on belief, and FluFrx clearly has it. Each upset makes the next one easier to imagine, and the pressure quietly shifts onto the favorites who suddenly have everything to lose.
Whether this becomes a Cinderella season or a great few weeks depends on what happens next - but FluFrx has already made the field respect it.