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 finally improved enough for slick-tyre runs from mid-afternoon.
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.
The Moto2 champion got to within 2.1s of Pedrosa at the end of his first run (see below).
Fellow MotoGP rookie Bradley Smith had made his own debut, on wet tyres, shortly after midday. Smith has since gone back out on slicks.
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, Rossi - who rode 28 wet laps during his Yamaha return at Valencia on Tuesday - and reigning champion Lorenzo have both reportedly been on track at Aragon, where some World Superbike teams are also testing.
Lorenzo fell without harm on the wet track.
for extensive picture coverage from the Valencia MotoGP test...
1. Dani Pedrosa
ESP Repsol Honda (RC213V) 1m 33.723s
2. Nicky Hayden
USA Ducati Team (GP12) 1m 34.080s
3. Alvaro Bautista
ESP Honda Gresini (RC213V) 1m 34.590s
4. Michele Pirro
ITA Pramac Racing (GP12) 1m 34.842s
5. Cal Crutchlow
GBR Yamaha Tech 3 (YZR-M1) 1m 35.122s
6. Stefan Bradl
GER LCR Honda MotoGP (RC213V) 1m 35.426s
7. Andrea Dovizioso
ITA Ducati Team (GP12) 1m 35.669s
8. Randy De Puniet
FRA Aspar (ART CRT) 1m 35.749s
9. Marc Marquez
ESP Repsol Honda (RC213V) 1m 35.846s
10. Danilo Petrucci
ITA Came IodaRacing (Suter-BMW CRT) 1m 36.157s
11. Andrea Iannone
ITA Pramac Racing (GP12) 1m 36.567s
12. Bradley Smith
GBR Yamaha Tech 3 (YZR-M1) 1m 37.020s
13. Hector Barbera
ESP Avintia (FTR-Kawasaki CRT) 1m 39.248s
14. Karel Abraham
CZE Cardion AB (ART CRT) 1m 39.272s
15. Aleix Espargaro
ESP Aspar (ART CRT) 1m 43.517s
USA Forward (FTR-Kawasaki CRT) No Time
JPN Avintia (FTR-Kawasaki CRT) No Time
GBR Paul Bird Motorsport (ART CRT) No Time
ITA Forward (FTR-Kawasaki CRT) No Time
ESP Yamaha Factory (YZR-M1) Not present
ITA Yamaha Factory (YZR-M1) Not present
Fastest Day 1 time:
ESP Honda 1m 35.936s
Official Valencia MotoGP records:
ESP Honda 1m 30.844s
Fastest race lap:
AUS Ducati 1m 32.582s