He wasn't out of action but he was surely too short for this match missing many break balls. He could have win this match but as usual he lost
First set : Arnaud was broken early but came back from 4-1 to 4-4 and saved 7/8 break balls in this set. In the tie-break he lost 6 points in a row to loose this one.
Second set : He lost his serve in first game but got one ball to break back in the game after and three others at 4-3 and an other one at 5-4 which he converted. He came back to 5-5 but lost again his serve and Melzer kept this break. In this set Arnaud saved 0/2 break balls an converted 1/5 (2/10 in the match)
He seems to be in a good fit to play quite good but fails on crucial points by the way many things to be more "depressed"
Go to NY now (after a big sleep) and wait better days