Louis van Gaal hit out at his players for almost allowing Roma to break his 100% record as Manchester United manager.
Van Gaal made it two wins from two as United boss thanks to a 3-2 win over the Italian giants in the Colorado heat.
Unlike in their 7-0 thrashing of the Los Angeles Galaxy, Van Gaal's men were slow off the mark and Roma wasted numerous opportunities to go ahead.
Wayne Rooney scored twice and Juan Mata also got on the score sheet with a stunning goal, but Roma fought back in the second half with two strikes - the first of which came from 60 yards.
Van Gaal was annoyed with the way his team failed to close the game out after going 3-0 up, but he thinks the fact that the game took place in 30 degree heat, some 5280 feet above sea level, did not help his players.
"I think we don't play a good match," Van Gaal said.