Moto2 world champion Marc Marquez turned heads by lapping an impressive 1.081s from the top during a 28-lap MotoGP debut on the final day of a rain-delayed Valencia test.
Below is a list of some other first-day MotoGP performances by riders that have recently made their premier-class debuts.
Casey Stoner - pictured on his MotoGP test debut for Honda Pons - stands head-and-shoulders clear of the rest.
Conditions at the 2005 test were cool and windy on day one
, when Stoner and Dani Pedrosa made their MotoGP debuts, then wet throughout day two.
This year's test saw a wet first day, when the likes of Marquez and fellow rookie Bradley Smith did not ride, with dry laps on the final afternoon.
Future double world champion Stoner later switched to LCR Honda for his first 2006 MotoGP season...Rookies: Time difference to fastest rider after first day at an official MotoGP test:Casey Stoner
AUS Pons Honda +0.64s
(Valencia 2005)Marc Marquez
ESP Repsol Honda +1.081s
(Valencia 2012)Dani Pedrosa*
ESP Repsol Honda +1.1s
(Valencia 2005)Andrea Iannone***
ITA Pramac Ducati +1.511s
(Valencia 2012)Jorge Lorenzo*
ESP Fiat Yamaha +1.982s
(Valencia 2007)Stefan Bradl
GER LCR Honda +2.144sec
(Valencia 2011)Bradley Smith
GBR Tech 3 Yamaha +2.216s
(Valencia 2012)Cal Crutchlow*
GBR Tech 3 Yamaha +2.302s
(Valencia 2010)Andrea Dovizioso*
ITA Scot/JiR Honda +2.412s
(Valencia 2007)Marco Simoncelli
ITA Gresini Honda +2.569sec
(Valencia 2009)Jonathan Rea**
GBR Repsol Honda +3.134s
(Brno 2012)Hector Barbera
ESP Aspar Ducati +3.544sec
(Valencia 2009)Alvaro Bautista
ESP Interwetten Honda +5.304sec
* Had previously ridden a MotoGP bike.
** Brno is a 2m lap, compared with 1m 30s for Valencia.
*** Had previously ridden a MotoGP bike and also rode some wet laps on day one at Valencia 2012.