The former Colorado Rapids has helped Reading to keep the best defensive record in the league this season, conceding just six goals in thirteen games for the club.
The 31-year-old made himself penalty king yesterday by pawing away a first half penalty from Neil Cox.
Following the match boss Alan Pardew heaped the praise on Hahnemann.
He told readingfc.co.uk: "Marcus is something else at the moment. He has trained like a demon and has lost weight, he looks better for it. He's as good as it gets.
"He was without doubt the best player on the pitch today. We feel his goalkeeping has improved since he came here and began working with Nicky Hammond.
"I think the game was won by our back four and our goalie."
Hahnemann will hope for another clean sheet on Tuesday when the Royals travel to Selhurst Park to play Crystal Palace. A win will elevate Reading to fourth place.