U.S. prospects blog: 10 Euro-based players with most to prove in 2015-16

With the 2015-16 European campaigns kicking off, a number of American youngsters are heading into hugely important seasons with their club teams. Here's a quick look at 10 Euro-based prospects 22 years old or younger -- all but one of them eligible for the U.S. under-23 squad that will attempt to qualify for the 2016 Olympics this October -- with plenty to prove this season.