same player, two matches. If both win one match, then the aggregate score decides. Ex:

SF2: @manuvert vs @practicaleric 32:28 (32181-28333)
First Leg: 34:28 (34035-27786); Winner @manuvert (2 wins, aggregate score 66:56)

so the winner is clear - he has won both matches

But here:

SF1: @masoom vs @browery 29:27 (28509-26514)
First Leg: 31:41 (31349-40559); Winner: @browery (1 win both, aggregate score 60:68)

the winner has been decided by higher aggregate score

BTW - in #MAcFiT the score is

• (step count / 1000) rounded to the nearest Integer.