There is 5000 xp required for level 10, but XP gaining for the Sprint is still the same. 10 xp for top-3 and 0 for other placements is, I'm sorry, piece of .
New managers will required 500 Sprint Races to unlock the leagues. 500! And it must be top-3! I think that's too much. Even my account, that's level 9, need more that 100 races to get level 10.