Actually I think the same thing was in GRID 1, when starting the race the camera drops to one of the racers and the guy tells you through the radio:
"He's in the best form, better watch out"
"This driver is insanely aggressive on the road, pay attention"
"This is the best track of this driver, good luck"
This could work so well in GRIP I think
"This driver knows that track, keep your eyes on him for shorter paths"
"This guy is ruthless, stay out of his way"
"This is one of the best drivers out there, keep him down"
"One of the drivers got bounty on you, watch for yourself"
"People bet a lot of money on that guy, take him down"
and something along this way