The respective Florida Pro titles stay in Florida for another year after Marks and Schweizer took over on finals day.
Marks continued her reign over home turf and Schweizer dethroned Evan Geiselman to take his first-ever QS win.
A marathon day decided finals day draw for both the men and women with no shortage of surprises.
The rest of the women's top seeds debuted and the men took over from there.
The final eight heats of Round 2 concluded and remaining top seeds laid down their authority before the men took over.
Caroline Marks and Evan Geiselman start their 2018 with huge wins at Sebastian Inlet.
Evan Geiselman and Caroline Marks earned huge wins on the shores of Sebastian Inlet.
The Australian provided the event's top performance so far as Quarterfinalists were decided at Sebastian Inlet.