It isn't like the Euros are playing over their heads, and the Americans are playing badly. Nick VDB and Daz are not playing that well. Ouschan is a machine. Boyes is playing very well, and Feijen is playing the way he plays. Shane is playing ok, Skylar and Justin are playing well, and Mike and Corey are succumbing to the pressure.
Pool is starting to mirror golf. For a long time, Americans dominated the PGA. There was the odd European that would come and win, but if you look at the face of golf now, the Euros are starting to produce the top golfers in the world. If you look at their schedule, they compete at least twice as often as the American golfers. They compete at most of the PGA events, as well as European tour events. Steel sharpens steel. You get experience by playing the best players in the world as often as you can.
have you looked at the world rankings in golf lately? Didn't think so. 6 of the top 10 are Americans and 13 of the top 25 are American. Compare that with 3 Euros in the top 10 and 7 Euros in the top 25. I'm assuming you are basing it on the Ryder Cup, which much like the Mosconi Cup is an exhibition and for whatever reason the Euro team gels better, but the comparison ends there. US golf is BY FAR, WAY better than European golf and it's not even close.