First match of the day, a match of young American hopefuls, Jack Sock was up 5-2 in the first set tiebreak against his practice buddy Steve Johnson. The USC legend smashed his racquet after missing a backhand pass and it seemed to unnerve Sock, his pal. Sock had set point at 6-5 and double faulted. Johnson won the next three points and just like that he swiped the set.In the second set it was on serve 2-3 and Sock lost on a drop shot and suddenly reached out to shake hands with Johnson. He had retired. Nobody saw this coming. It was extremely hot today - I hit for an hour in the afternoon and it was quite rough - but Sock has to get stronger and tougher to be able to deal with these conditions. He was looking in control until the Johnson racquet smash, which like I said earlier, seemed to rattle him, as if he was not ruthless enough to want to destroy his pal Johnson. It was odd. Sock stayed around all day and was there until the start of the Harrison-Arguello main event at 6:30.Jesse Levine lost a tough three setter to Somdev Devvarman, 6-4 in the third, after Sock-Johnson, in the heat of the afternoon. Alex Bogomolov, fresh off winning the Mexico Challenger last week against Rajeev Ram, lost to Wayne Odesnik 6-1 6-1.Mitchell Frank, the Virginia University team member got a wildcard into the event and came down here from his campus, and was up early 2-0 on Teymuraz Gabashvili, but the hard-hitting veteran from Russia dug down and took over the match, coasting to victory in the second. I was impressed by Frank's backcourt consistency.The night match was Ryan Harrison vs. Facundo Arguello from Argentina. Harrison lost the first set in a tiebreak and fought back with some crafty clay court tennis in the second to go up the break but Arguello battled back and despite a 0-40 hole at 4-4, the Argentine still held serve and then broke Harrison at 15 to win the match.Harrison did not look at his best all week the times I saw him hitting, he showed some brilliance in flashes and some nice touch drop shots and a beautiful serve and volley execution but it seems he's low on confidence right now after so many tough draws and a poor won/loss record this year. In other matches, my guy Ilija Bozoljac came back from trouble in the third set to beat the Korean qualifier in a thrilling match on an outer court. And Ivo Karlovic, probably in his final year on the circuit, lost a three setter to Denis Molchanov. Michael Russell, the #1 seed also lost decisively.