Daniel Ricciardo posted a new unofficial lap record around the current layout of the Circuit de Barcelona-Catalunya to lead both Mercedes drivers on the second day of the second test.
The Red Bull driver completed a full Grand Prix weekend simulation, posting a 1:18.047s on the Hypersoft tyre in his mock qualifying run late in the morning, surpassing the previous mark set by Felipe Massa in testing in 2008.
In the afternoon, Ricciardo then became the first of two drivers to complete a full race distance, running a 66-lap stint complete with pit-stops as part of a massive total of 165 on the day.
Lewis Hamilton and Valtteri Bottas both would set their best time on the Ultrasoft compound rubber, one step harder than the leading Australian, but the world champion would be .353s down in second with his teammate a further tenth-and-a-half back.
The other main story of Wednesday was the ongoing woes at McLaren as, after a strong start with 46 laps on the board, Fernando Alonso would come to a halt at Turn 7 two hours in, causing a red flag.
An oil leak was given as the cause of the failure and the Spaniard would not be seen again until the final 13 minutes of running, he would, however, set the fifth best time.
Elsewhere, Ferrari ran a split program with Kimi Raikkonen feeling unwell in the morning. Sebastian Vettel would take over for the first four hours, setting the fourth best time before handing over the Finn in the afternoon.
Using the Soft compound the Scuderia's times were some way off their rivals with Vettel one-and-a-half seconds slower than pacesetter Ricciardo.
Brendon Hartley would have a minor problem in the afternoon, otherwise it was another good day for Toro Rosso-Honda as the New Zealander completed 118 laps, setting the fifth best time.
Renault would get through a monster program of their own with their two drivers as, firstly, Carlos Sainz did 88 laps, setting the sixth best time on Medium tyres before Nico Hulkenberg would do a full race simulation in the afternoon as part his overall tally of 102.
The result would be 190 laps for the Enstone team, the most of any team on the day and in direct contrast to the problems their customers, Red Bull and particularly McLaren, have had so far.
Romain Grosjean continued Haas' steady pre-season with a solid 75 laps and the seventh best time, just 0.005s ahead of Raikkonen's Ferrari.
Williams had a productive day with Lance Stroll and Sergey Sirotkin combining for 139 laps but with the Canadian in 10th and the Russian 14th (bottom of the times), the pace still isn't inspiring.
The same can be said of Force India with Esteban Ocon only 12th, though 130 laps was a good return for the Frenchman albeit 30 less than Sauber driver Charles Leclerc as the Monegasque managed 160 tours but only the 13th best time.
18 Thoughts from F1 2018: Honda finally
18 Thoughts from F1 2018: Alonso finally
Wolff: We trust Bottas but Ocon is a Mer
Ricciardo: Monaco victory was more about
McLaren wants full budget cap regulation
Mercedes: Circumstances of Bottas' Baku
Verstappen could have finished P2 in cha
Hamilton 'the best since Senna' over a s
Silverstone rejects latest reports on ef
Mercedes' Costa plays down 'setback' cla
Racing Point to launch new name & 2019 c
Michael Schumacher 'not bed-ridden' as h
Norris & Sainz open to Alonso testing 20
Mick Schumacher was never considered for
Mexican official denies 'bribery' claim
Ricciardo admits Verstappen relationship
Grosjean believes in Haas dream to catch
Lowe: Williams have already fixed the pr
Red Bull doubt Renault will catch Merced
Vettel still to show his best at Ferrari
Sauber acknowledge Ericsson role in help
Grosjean vows not to repeat early 2018 m
Verstappen still lacks one major asset t
Brawn has plan to stop top teams gaining
Alonso a 'more complete driver' thanks t
Red Bull insist Verstappen will not be f
Leclerc sets reasonable target for first
Monza plans big renovations for centenar
Ferrari much more of a unit compared to
Bottas: Worrying about Mercedes exit rum
Russell sets midfield goal for Williams
Brawn reveals agreement to help new engi
Ferrari confirm February launch date for
Perez talks up Stroll potential, plays d
18 Thoughts from F1 2018: Are Williams o
Ricciardo: Taking Renault 'to the next l
Norris wants to 'beat Sainz at every rac
Vettel has one problem with Kubica's F1
Pirelli has asked teams to simulate mand
McLaren 'very happy' with Renault, expec
Schumacher chooses Ferrari Academy over
Stroll matched Ocon in the simulator and
Wolff identifies race where he 'felt the
Sainz: McLaren aiming to lead the midfie
Marchionne death was a 'big loss' to Fer
Stewart hails Verstappen and arrival of
Kubica suggests Williams ignored initial
Bottas to contest Arctic Lapland Rally i
Vettel unsure if he'll enjoy same Ferrar
Alonso was 'never on the right team at t
Verstappen: F1 success 'a lot easier' fo
Mercedes had a pace advantage over Ferra
Ecclestone reveals Silverstone bid and f
Bianchi death & personal reasons re-shap
Hamilton had to be reigned in during sup
Norris believes McLaren more focused on
Grosjean: I have same desire to win as A
Verstappen only wanted to make Renault '
Kubica talks up F1 return: 'I know what
Wolff: Leclerc save at Spa vindicates Ha
Mexico GP future plunged into doubt by n
Wolff again raises prospect of future Sc
Sainz feels no pressure replacing Alonso
Hamilton just a 'chink in a chain' at Me
Raikkonen surprised by similarities betw
Renault reveal huge power deficit to eng
Verstappen still peeved by 'unfair' Monz
Hakkinen draws comparison to his early c
Mercedes' 2019 engine not yet hitting pr
Hulkenberg not so interested in comparis
Ecclestone warns against rise of street
Hartley hints Toro Rosso exit was politi
FIA concludes Halo did prevent Alonso's
Ricciardo: Process of making 2019 decisi
Brown: McLaren's 2018 a result of years
Giovinazzi expecting 'tough' start along
Pirelli: Tyres not only to blame for con
Vettel gets Di Montezemolo support: Schu
Ericsson tips - and hopes - Leclerc to '
Magnussen has 'almost forgot' what wins
Red Bull worried of help Ricciardo can g
Ericsson claims F1 is 'artificial' in co
Gasly will give Verstappen the 'hardest
Renault: 2019 potential depends on Red B
Russell wants to work with Kubica to pus
Racing Point will not be Force India's n
Hamilton expecting another title fight w
Ferrari admit possible benefits but want
Verstappen & Leclerc will be F1's new Ha
Schumacher's 2006 retirement left Ferrar
Sirotkin: 2019 Williams seat 'looked qui
Liberty 'trying' for Silverstone deal bu
Vettel would have been F1 champion with
Verstappen hints at 'Plan B' if Red Bull
Ricciardo denies money the cause for fai
Alonso leaving F1 akin to 'Real Madrid w
Gasly & Verstappen a 'good partnership'
Bottas rejects idea of seeking Rosberg a
Leclerc can be the 'incentive' Vettel ne
Todt suggests Verstappen becomes a stewa