Karun reports from trackside in Bahrain
"This is the first time in this test that the Mercedes looks like a Mercedes to me.
"Bottas is able to carry a huge amount of speed into corners and the rear of the car is sticking with him. We didn't see that with Lewis Hamilton in the car.
"Bottas seems to be unlocking the potential of that W12."
Karun reports from trackside in Bahrain
"This is the first time in this test that the Mercedes looks like a Mercedes to me.
"Bottas is able to carry a huge amount of speed into corners and the rear of the car is sticking with him. We didn't see that with Lewis Hamilton in the car.
"Bottas seems to be unlocking the potential of that W12."