underground
G.O.A.T.
Let's see how long this servebotting will work before Del Potro figures out Isner's serving. This tournament will be more exciting if Del Potro advances instead of Isner.
Delpo has a mental block against Isner. In 2013 Cinci he was MP up but double faulted and let Isner come back and win. Last year he was a win away from the WTF but he dumped a rubbish service game out of nowhere to hand Isner the victory.