SV Hamburg Tim Walter believes his second division side can cause a German Cup semi-final upset against Freiburg on Tuesday despite appearing set to miss out on promotion back to the Bundesliga once more. “The opponent plays a league higher and is on the way to the Champions League, we’re nominally the challengers,” Walter told reporters on Monday. “We’re eager for this big game and have a super platform with a sold-out stadium. It’s difficult for every opponent in front of 57,000 fans.” Hamburg are in their fourth season in the lower tier since their first-ever Bundesliga relegation in 2018 a…