Upsets have been the theme at the 2014 Fayez Sarofim & Co. U.S. Men's Clay Court Championship.
Only two of the eight seeds have advanced safely into the quarterfinals. Fernando Verdasco (4) and Nicolas Almagro (3) are the only two whom remain in Houston.
John Isner came in as the top seed, but was upset by Dustin Brown in his first match.
However, the Americans have played surprisingly well on what is usually considered their worst surface as a group. Three of the quarterfinalists are Americans, and all three of them upset seeds to get here.
Now, let's take a look at the quarterfinal matchups.
Here is the schedule for April 11.
The draw can be found here.
**All stats courtesy of atpworldtour.com