#1 Pastor Maldonado (Spain 2012)
The most successful Venezuelan Formula 1 driver won his only race in incredible circumstances.
Williams were coming off what was (at the time) their worst season in F1 in 2011, but 2012 was going better, with Bruno Senna picking up decent points finishes in both Malaysia and China.
Pastor Maldonado was lagging slightly behind his Brazilian teammate, but that was about to change in magnificent style in Spain.
Lewis Hamilton had initially qualified on pole for the race, but his McLaren was found to be underweight during Q3, meaning that he had to start from the back.
Amazingly, this meant that Maldonado inherited P1 on the grid, upgrading an amazing qualifying performance into an unbelievable one.
The start, though, didn't go to plan as home-favourite Fernando Alonso stormed into the lead at the first corner.
Maldonado kept the Spaniard within reach in the following laps, much to the surprise of everybody.
By the time the second set of pit-stops came, Maldonado was still within a few seconds of Alonso, meaning that there was potential for the undercut to work.
Alonso was slowed while lapping traffic and Ferrari were too slow to react, meaning that Maldonado was incredibly in the lead.
The Circuit de Catalunya is one of the hardest tracks on the F1 calendar to overtake on, and this showed as, despite Alonso's best efforts, he couldn't get in a position to challenge for the lead.
Maldonado held on to the finish, becoming the only Venezuelan to win a Grand Prix and Williams' most recent race winner, having last won back in 2004 before that.
It was a bittersweet day for Williams, though, as the Grove outfit's garage suffered a fire shortly after the race, although nobody was seriously injured.
But what do you think is Formula 1's most surprising ever race winner? Was it Maldonado or another shock that thrilled you the most? Let us know in the comments below!