The visitors tried to endear themselves to supporters from Wisconsin by wearing the hats associated with the Green Bay Packers.
Meanwhile, Rory McIlroy believes retaining the trophy would be a “monumental achievement.”
The 2020 US Open champion has been involved in a long-running feud with Ryder Cup team-mate Brooks Koepka.
In an interview last week the four-time major champion said he finds the biennial event “tough, hectic and a bit odd”.
Fifteen years on he will be part of the European team attempting to retain the trophy at Whistling Straits.
The Sheffield-born player was just 22 during the last away contest at Hazeltine in 2016.
With coronavirus travel restrictions preventing large numbers of fans travelling, Padraig Harrington’s side are braced for a one-sided atmosphere.
The Northern Irishman will be part of Europe’s bid to retain the trophy at Whistling Straits later this month.
The Swede claimed his second European Tour title after finishing with a 72.
Half of captain Steve Stricker’s side have never played in the biennial contest before.
Former Ryder Cup captain Paul McGinley believes attempting to make capital from the spat could backfire.
The 35-year-old secured the course record at Bernardus Golf.
The Spaniard has won 25.5 points at the Ryder Cup.
Nine birdies helped him to a score of 64 in the second round at Bernardus Golf.
The United States will be hoping to make the most of home advantage at Whistling Straits.