Jack Robinson has extended his lead at the top of the World Surf League rankings despite falling in the Rip Curl Pro Portugal final to Joao Chianca.

The West Australian went down in a high quality decider at Supertubos, with his two-wave score of 15.14 topped by Chianca's 17.57.

Collecting his first tour win, the 22-year-old Brazilian was never really headed and posted back-to-back scores of 8.50 and 9.07 with barrels aplenty at the Peniche break.

Despite the loss Robinson was happy with his consistency, bringing the yellow leader's jersey to Australia with the Rip Curl Pro Bells Beach kicking off on April 4 followed by an event at his home break, Margaret River, which he won last year.

"I've got a lot of gratitude right now and I'm just super grateful to be here in Portugal," Robinson said.

"I had a good event. I'm just going to try to keep the journey and the momentum going, it's just step by step for me and I'm just super happy."

Teenager Caitlin Simmers won the women's event over Courtney Conlogue in an all-Californian final.

Conlogue opened with a spectacular 9.00 but was unable to find another solid score with the tour rookie posting a total of 13.50 for a tight win over her compatriot's 12.83.

Australian Molly Picklum hung on to the women's rankings lead despite bowing out in a tight quarter-final against defending Portugal champion Tatiana Weston-Webb.

In an action-packed day, Macy Callaghan was Australia's best performer in the women's draw - reaching the semi-finals before she was eliminated by 17-year-old Simmers.

Simmers kicked off their heat with a big score of 8.67 en route to a final two-wave score of 13.00 while Callaghan, from Avoca north of Sydney, never really got going as she tallied 6.04.

On the men's side Callum Robson, who scored a perfect 10 earlier in the event, also made the final four before the Australian was taken out by Chianca.

While Picklum leads the women's rankings ahead of Simmers and Carissa Moore in joint second, Tyler Wright, who made an early exit in Portugal has held on the fourth spot.

Defending world champion Stephanie Gilmore has dropped down three places to 14th - needing to climb two places in the Australian events to make the mid-season tour cut-off.

Robinson leads a trio of Brazilians in the rankings with Robson the next best-placed Australian in joint seventh, while Ethan Ewing is 10th.