Can Roger recover from this setback

In a major setback, top seed and World no.5 Roger Federer succumbed to a 6-2, 6-7, 4-6 defeat to wildcard and World no. 302 Tommy Hass on his return to the ATP World Tour at the Mercedes Cup grass court event in Stuttgart in the round of 16.

The loss was the 35 year old's first, to a player ranked 300 in the world or below since 1999 (at that time an 18 year old Roger Federer wasn't in the top 100)
Federer's game was not at the level at which it was in March and he failed to capitalise on the key moments such as a match point opportunity in the 2nd set tie break and allowed Tommy Haas to level the contest. The 39 year old rode on a wave of momentum and denied Roger 7 break points in the 3rd and converted one of his own break opportunities.

0/7 on break points in the decider against a man who has 4-8 win-loss this season, is a telling stat. Major cause of concern for Federer. He lost the 2015 U.S.Open final to Novak Djokovic as his breakpoint conversion was an abysmal 4/23 that night.

Roger Federer had created that aura of invincibility around him post the sunshine double, but with his defeat in Stuttgart, that has been shattered. Players will believe that Federer is beatable and he will be under the pump even more (most players already raise the game when they are up against a big name) Federer doesn't take many matches to get up to full speed is a common statement. But if people are looking at the start of the year as an example they are mistaken.
Federer himself has stated that he only practises on hardcourts. So, for him the court transition in January from the hardcourts in Basel to Melbourne's fast courts was relatively easier than what it will be now from the quick hardcourts to the even quicker and skiddy grass courts.

This was a test of how Federer's knees hold up to the fast grass courts after his hiatus, and he failed miserably. If last night's game was an indication of his form. One can safely say that Wimbledon won't have its first ever 8 time men’s singles champion.

No matter how rested or how many balls he had hit in practice or how talented a player is. He needs matches to get the feel of playing well and in those matches he will experience crunch situations and get the experience of having to raise his game at the crucial moments in matches. In both of Federer's losses this year he had match points and failed to convert them.

Having registered for the tournament in Halle, Federer can get in some valuable practice and matches in on the lush green lawns. A similar early exit in Halle could prove to be disastrous to the 18 time Major winner as he will head off the SW19 with hardly any grass court matches under his belt.

In the writers opinion, he played better on grass last year when he was on one leg than he did last night against Tommy Haas.
 
Can Roger recover? He desperately needs to turn this around and if his career is any indication, he will do his utmost best to do so. But will it be enough?