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:
AUS Pons Honda +0.64s
ESP Repsol Honda +1.081s
ESP Repsol Honda +1.1s
ITA Pramac Ducati +1.511s
ESP Fiat Yamaha +1.982s
GER LCR Honda +2.144sec
GBR Tech 3 Yamaha +2.216s
GBR Tech 3 Yamaha +2.302s
ITA Scot/JiR Honda +2.412s
ITA Gresini Honda +2.569sec
GBR Repsol Honda +3.134s
ESP Aspar Ducati +3.544sec
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.