Both players traded words in an intense, edgy match. A pat on the back for the injured Del Potro and Andy's into the second round...
The Argentine retires: a break down in the third set, Del Potro tweaks his back stepping in from the baseline. It's over...
Back into it in the second set: sliced backhand as Andy serves for the set.
Frustration early on as Andy loses the first set 7-5
Getting some treatment on the tired legs, first set
Pausing for thought....
Lining up a backhand vs. Stan Wawrinka.
