I think Amer is getting a little stronger, mentally. After he lost the game serving for the match and went down 0-30 at 5-5, I pretty much expected him to lose. He's had such a hard time closing out matches during his pro career and I thought he'd fall apart again.
But he pulled it together and won the match. I think he's making progress. The main thing holding Amer back from being a top-50 player, imo, is mental toughness and I think he's slowly improving in that area.