Your last comment, prospero, prodded me to look again at 2 and 10; it would be very slapdash of the Guardian to allow alternatives. I’ve given it more thought and I have to admit that my previous suggestion was incorrect (and apologies for that). Lars remains the answer to 10 as you say, with no other alternatives.
2 down is, actually, easy if you know about bowls, not cricket; I know little of either. One of the definitions of mark is ‘the jack at bowls’. This is the small white ball aimed at in bowls. The answer has a definition of ‘(in the game of bowls) a bulge or greater weight on one side of a bowl making it turn to one side’. This fits in the -i-s slot.
This is about 95% of the answer, the 5% I’ll leave to you.