Not diamond. Even if those two matches were a everyone left so you was on your own, I'd say you could have gotten 2900 though if you completely carried the team.
Guys you gotta remember you can't preform if you have leavers. Your down at least a man permanently. Which means your always going in the fight with less damage/heals/tanks. It's why when one person is picked off the entire team will push because 6 v 5 is quite easy to win.