I disagree, he was a starter his whole career until halfway through his season in AAA this year, he can handle the workload. Plus since he's been a closer (the start of August), Servais has only used him once in a 1+ inning situation. Not to mention, the only other relievers he had at his disposal were Arquimedes Caminero who has a 5.68 ERA over his previous 6.1 innings in relief work and Pat Venditte who pitched 3 innings the previous night, so he probably wasn't available. In a one run game while you're in the middle of a playoff hunt against your division leader, I think putting Diaz in there for two innings with those limited options is the right call. His arm isn't going to fall off, and he's been the best strikeout reliever in all of baseball. He has a 16.3 K/9. That's better than Chapman, Kimbrel, Miller, and Betances. Servais only had one reliable option if he wanted to beat the Rangers, and it was using Edwin Diaz.