1vs1 Rating 1500+ 9 loses from 10

1vs1 rating from this guy, how is this even possible to lose 9 games from 10 and to get 1500+ rating?!

He has won first game and got 1800 rating I think, the algorithm gives you so much points if your team game rating is above 2.2k
Then he started to lost high level players. Thats all.