I’m a plat 1/2 player, but I’m going against high plat to high diamond players. I have a friend who’s plat 3, almost diamond 1, but all of his games are full of gold 2-3 players with the exception of a few low plat players. Why does this...

I've seen folks tell opponent ranks at the start of the game? What tracker is this? I've used tracker.gg but that updates once the match finishes