They've been on the same team since Kevin Durant and Russell Westbrook joined the NBA, but for one brief glimpse we got to see them go head-to-head at the 2009 NBA All-Star Weekend Rookie Challenge. KD was on the sophomore team and Russ on the rookie team.
Looks like Russ might have had something to prove! Durant did as well, however, and would end up taking over the game for the sophomores and named MVP.