Sakhir, Bahrain:  Mercedes drivers Lewis Hamilton and Nico Rosberg say their relationship as teammates is likely to be tested this season as they battle for the Formula One title, with both expecting conflict between them at some point.Having split the opening two races of the season, and with Mercedes clearly the dominant team heading into this weekend's Bahrain Grand Prix, the pair are already seen as the two front-runners for the championship.While Hamilton and Rosberg get on better than many other sets of teammates in F1 - having raced with and against each other since they were kids in go-karts - both said Thursday that their relationship may be damaged during their looming title...
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