Although the idea of overloading the midfield makes sense, dropping one of the team’s fastest and most agile players into an unnatural position is puzzling, especially when the midfield of Tillman, Quinn Sullivan and Brendan Aaronson doesn’t offer much in the way of pace.

Patrick Agyemang’s 75th-minute goal secured a 2-1 victory in Arlington, Texas. The quarterfinals are next.

The U.S., which opened with victories over Trinidad and Tobago and invited guest Saudi Arabia, won its group for the 17th time in 18 Gold Cups. The Americans have 43 wins, one loss and five draws in group play, going 3-0 for the seventh time.