Hearts could not follow up Tuesday night's opening victory as they lost narrowly to Slask Wroclaw.
The Jambos beat Goslar 08 2-1 last night on the first match of their tour of Germany.
However, they went down 1-0 against Polish side Slask after fielding a young side skippered by Michael Stewart.
Both sides created early chances with the Poles dangerous at times.
As the game wore on a goalless draw was increasingly likely until Tomasz Szewczuk capitalised on Adrian Mrowiec's mistake to fire home the decisive goal.