For the fourth year running, Atlas F1 is going to keep an eye on the battle between teammates throughout the season with a simple measurement: we compare the qualifying times of each driver against his teammate's result. After every Grand Prix, we will show how teammates have fared up against each other, and where they are overall since the beginning of the season. At the end of the season, the World Champion of Qualifying Differentials will be elected - the driver who was most beaten by his teammates, in seconds. Only those who participate in at least 15 of the 17 rounds are eligible for the coveted crown; and for those who made the efforts and participated in all 17 races, the best and worst result will be scrapped.

With thirteen qualifying sessions completed for 2001, the differentials are on a roll! Let's see which drivers deserve bragging rights.

Hungary Notables

• Setting the records straight. Fernando Alonso equalled his best previous result, qualifying 18th on the grid.

• Frentzen/Alesi. The Jordan-Prost musical chairs ended with Heinz-Harald Frentzen and Jean Alesi expected to swap locations on the grid, but in reality they didn't quite end up miles apart. Nevertheless, while Jean Alesi was squarely stomped by his new Jordan teammate - Jarno Trulli outqualifying the Frenchman by more than a second - Heinz-Harald Frentzen put in a rather respectable performace, qualifying over a second ahead of teammate Luciano Burti.

• Changes since Germany: none whatsoever.