Jordan Spieth, Jon Rahm's caddie get into animated disagreement over drop

Things are getting chippier at Whistling Straits.

After a day full of non-gimmes and a testy exchange between the American team of Brooks Koepka and Daniel Berger and some rules officials, a dispute over a drop between Jordan Spieth and Jon Rahm's caddie, Adam Hayes, during a Ryder Cup fourballs match added to the growing list of extracurricular excitement.

The incident happened at the par-5 fifth hole, where Rahm drove his tee ball into the water right. While all four players, including Koepka and Sergio Garcia, initially agreed where the ball had cross into the penalty area, by the time Rahm got to the agreed-upon spot, a spotter told Rahm he thought his ball had crossed some 20 yards…