Jack Sock | TENNIS.com

The No. 14 seed lost to Jiri Vesely of the Czech Republic, 7-5, 7-5, 6-3, on Monday.

Five Americans ready to make a charge at the French Open

Sock, Vandeweghe and more have the potential to make a dent in their respective draws.

Rafael Nadal beats Jack Sock to reach Italian Open quarterfinals

Fourth-seeded Nadal broke Sock's serve twice in the second set.

In other action, home favorite Fabio Fognini plays Alexander Zverev.

Johnson defeats Sock in Houston semis, will face Bellucci for title

Bellucci defeated Ernesto Escobedo, 5-7, 6-4, 6-2.