It is written into the DNA of every Formula One driver that the first person you have to beat is your teammate.
You might hear drivers say it's not important how they are doing compared to the person on the other side of the garage.
But teammates are the only drivers who have to race under almost the same conditions as each other every weekend.
So a driver's best performance indicator is usually within the team.
There are different ways you can dominate your teammate. Consistently out-qualifying shows a better ability to extract the maximum from the car, while better qualifying positions on average indicate a greater raw pace.
Outscoring teammates is an obvious, though inconclusive, barometer. Generally it suggests a driver threads a race weekend together better, races wiser and is more consistent.
But extenuating circumstances such as mechanical misfortune, other drivers making errors or poor team decisions blur the picture.
With that in mind, let's take a look at the teammates who are enjoying garage dominance so far in 2013.