CHARLOTTE, N.C. — When Patrick Cantlay drained a putt from deep on one of the toughest par-4s on the course, Hideki Matsuyama and Tom Kim shook their heads and exchanged a smile as if to say, “What else can we do?” It’s a legitimate question. The U.S. pairing of Cantlay and Xander Schauffele again led another dominant day for the heavily favored Americans on Friday at Quail Hollow Club in Charlotte. They finished their rounds with an insurmountable lead on the 15th hole — up three with two to go — and paced another 4-point day for the US. The Americans now lead the International side 8-2 headi…