Following Sunday's season-ending Valencia Grand Prix, a two-day post season MotoGP test began at the circuit on Tuesday.
Day one was marred by poor weather, which caused seven of the 21 riders to remain in the pits and prompted the Factory Yamaha team to send Valentino Rossi and Jorge Lorenzo to Aragon for day two.
Unfortunately, it rained at both Valencia and Aragon on Wednesday morning - but conditions at Valencia have finally improved enough for some mid-afternoon slick-tyre runs.
That convinced 2012 title runner-up Dani Pedrosa to head out for the first time since winning Sunday's race - and Pedrosa was on top of the timesheets by 3:30pm, when new Repsol Honda team-mate Marc Marquez finally made his MotoGP debut.
UPDATE: Moto2 champion Marquez got to within 2.1s of Pedrosa's best lap time (now down to a 1m 33.7s) at the end of his first seven-lap run on the RC213V.
Fellow MotoGP rookie Bradley Smith had made his own debut, on wet tyres, shortly after midday. Smith is yet to ride with slicks.
As well as Pedrosa, Marquez and Smith, Cal Crutchlow, Shane Byrne, Danilo Petrucci and Lorenzo sat out day one of testing. Ben Spies, moving from Yamaha to Ducati for 2013, is not present due to recent surgery. His place is being taken by new Ducati test rider Michele Pirro.
Alvaro Bautista's Tuesday time was set on slicks, just before rain arrived.
Despite the poor weather at Aragon, Rossi - who rode 28 wet laps during his Yamaha return at Valencia on Tuesday - and reigning champion Lorenzo have both reportedly been on track, where some World Superbike teams are also testing.
Lorenzo fell without harm on the wet track.CLICK HERE
for extensive picture coverage from the Valencia MotoGP test...
1. Dani Pedrosa
ESP Repsol Honda (RC213V) 1m 34.911s
2. Nicky Hayden
USA Ducati Team (GP12) 1m 35.484s
3. Michele Pirro
ITA Pramac Racing (GP12) 1m 35.544s
4. Andrea Dovizioso
ITA Ducati Team (GP12) 1m 35.885s
5. Randy De Puniet
FRA Aspar (ART CRT) 1m 36.132s
6. Danilo Petrucci
ITA Came IodaRacing (Suter-BMW CRT) 1m 36.157s
7. Alvaro Bautista
ESP Honda Gresini (RC213V) 1m 36.418s
8. Andrea Iannone
ITA Pramac Racing (GP12) 1m 38.251s
9. Aleix Espargaro
ESP Aspar (ART CRT) 1m 43.517s
10. Marc Marquez
ESP Repsol Honda (RC213V) 1m 44.934s
11. Bradley Smith
GBR Yamaha Tech 3 (YZR-M1) 1m 46.566s
12. Hector Barbera
ESP Avintia (FTR-Kawasaki CRT) 1m 47.386s
(9/17) Colin Edwards
USA Forward (FTR-Kawasaki CRT) No Time Stefan Bradl
GER LCR Honda MotoGP (RC213V) No Time Hiroshi Aoyama
JPN Avintia (FTR-Kawasaki CRT) No Time Karel Abraham
CZE Cardion AB (ART CRT) No Time Cal Crutchlow
GBR Yamaha Tech 3 (YZR-M1) No Time Shane Byrne
GBR Paul Bird Motorsport (ART CRT) No Time Claudio Corti
ITA Forward (FTR-Kawasaki CRT) No Time Jorge Lorenzo
ESP Yamaha Factory (YZR-M1) Not present Valentino Rossi
ITA Yamaha Factory (YZR-M1) Not present Fastest Day 1 time:Alvaro Bautista
ESP Honda 1m 35.936sOfficial Valencia MotoGP records:Best lap: Dani Pedrosa
ESP Honda 1m 30.844s
(2012)Fastest race lap:Casey Stoner
AUS Ducati 1m 32.582s