Stormy conditions have prompted organisers to call a lay day on the ninth day of the World Surf League (WSL) event in Portugal.
Stop No.10 of 11 on the championship tour could potentially culminate in reigning champion Gabriel Medina of Brazil lead the charge heading into the final leg at Hawaii's Pipeline.
"It's not looking great, the swell has dropped a little bit but the wind is really strong onshore, so we won't be running any heats today," said WSL deputy commissioner Travis Logie.
"Conditions are very unpredictable so we have to keep coming back here every morning. It looks like there's potential for some surfing on Friday and Saturday, maybe even tomorrow could surprise us."
Organisers and surfers will reconvene on Thursday morning (local time) to re-assess conditions at Supertubos.
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On Tuesday, former world champion Joel Parkinson won through to the quarter-finals, eliminating US surfer Kolohe Andino in their fifth-round match-up.
The Australian world No.18 capitalised on an early start with a long wave surfed in the opening minutes of their exchange at back-up location Molhe Leste in Peniche.
"It's a really good location, it's a really fun wave," 2012 world champion Parkinson said after the win.
"It has that slingshot effect and I was buzzing to get out there."
The 34-year-old will meet Brazil's No.6-ranked Filipe Toledo in the last eight.
He's the last Australian left in the event, after compatriot Mick Fanning's shock elimination on Sunday.
But, Fanning's world championship lead was preserved when Adriano De Souza was also upset by a local surfer.
He holds a small lead over De Souza in the overall standings as he seeks his fourth world crown.
