Kevin Anderson and John Isner are the more well-known products of the U.S. college tennis system.
But in the doubles ranks, players from all over the world who played college tennis in the U.S. are a legion.
Gille graduated from East Tennessee State in 2012. Vliegen earned undergraduate and graduate degrees in business from East Carolina University.
They first teamed up six years ago at the Futures level in Belgium.
They won their first ATP Tour title last week in Bastad.