Mercedes' Lewis Hamilton and new team mate Valtteri Bottas have been the two most closely-matched team mates on the grid in 2017 so far.
Esteban Ocon has shown signs of being a serious threat to team mate Sergio Perez which could give Force India more headaches in the second half of 2017.
In the round-up: Grosjean wants Renault return 'when we can be champions' • Honda 'can pass Renault this year' • Engine moves may stop Alonso Indy return