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Leon Haslam climbed the World Superbike time sheets to top the final free practice session before Superpole despite struggling with the ribs he broke four weeks ago at Imola.
The 33-year old needed painkillers to help him through Friday's action and after placing inside the top-six on Saturday morning, he lapped Portimão's challenging undulations 0.047s faster than Tom Sykes to lead FP4.
Sykes will have been encouraged to end the session second, over two tenths of a second faster than team-mate Jonathan Rea, who placed third.
Underlining the strength of Aprilia's RSV4 RF around the 2.7 mile track, Jordi Torres was fourth in an encouraging session for the Noale outfit.
Having experimented with a new exhaust system on Friday, which gave him a 'more progressive, clearner' engine power curve, Davide Giugliano was a full 0.6s off Haslam in fifth, while team-mate Chaz Davies – struggling with front-end feel on Friday – was sixth.
There were further improvements for the Pata Honda squad as Sylvain Guintoli ended the session in seventh with Michael van der Mark, entering SP1 this afternoon, ninth.
Ayrton Badovini continued his progress well inside the top ten with the eighth best time, two places ahead of Alex Lowes, who in team boss Paul Denning's words has been 'struggling to find performance' from the GSX-R1000 this weekend.
The Englishman rounded out the top ten with a lap 1.5s slower than Haslam's marker.