Having dominated five Formula One races this season, the Mercedes team and former champion Lewis Hamilton are hoping that rivals Red Bull and Ferrari give him a stiff challenged at this weekend's Monaco Grand Prix.
Hamilton, who has won four of the five races, has said that if there is competition, victory seems sweeter.
Some drivers believe the unique characteristics of the Monaco street circuit give the rivals of Mercedes' their best chance of winning.
The BBC quoted Red Bull's Sebastian Vettel, as saying that Mercedes' stars Nico Rosberg and Lewis Hamilton have always put in good performances on the Monaco circuit, and that these two are the ones to beat.