A 3-1 defeat by Hannover 96 was preceded by a 1-1 draw against Arminia Bielefeld.
Sunderland next play Borussia Moenchengladbach on Saturday hoping to end their tour on a positive note.
Yet despite the results, Bruce is pleased to see the fitness levels of his players improving.
“This tour has been a fantastic exercise for us and we’re looking to end on a high,” he told reporters.
“Fitness remains our priority, but it would be nice to round things off with a win and kick on strongly into our remaining friendlies in the UK.
“With the numbers available to me I will be able to mix and match. Moenchengladbach are a strong team – you have to be to survive in the Bundesliga.
“From what I know there’s going to be a big crowd there and it should be a fantastic occasion for both sets of players.”
In both tour matches to date, Bruce has played Stephen Sessegnon behind Asamoah Gyan in a new formation which he has indicated he will use next season.
Sessegnon has scored both of Sunderland’s goals on this tour and looks the favourite to keep that role in a 4-4-1-1 formation when the season starts at Anfield next month.
The Black Cats struggled last season after the departure of Darren Bent to Aston Villa and injuries to strikers Gyan, Danny Welbeck and Frazier Campbell.
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Steve Bruce pleased with Sunderland’s pre-season tour of Germany despite poor results