Hacking Alliance

Hello,
I just looked in the Top 10 Leaderboard of 10v10 Battlegrounds and in the top 10 ist just Alliance with about 300 Wins/1 Loss, It’s either one insane good player or this guy is hacking. Does anybody knows what is right and what We can do to report them ? Because 300/1 there has to be anything wrong,

I am sorry for my bad english, I’m not a native speaker. Hope to hear from you guys soon.