Jack Sock was up a set and 3-1 against lucky loser Ricardas Berankis and only won two more games the rest of the match, completely collapsing in a 1-6 third set. Sock was in firm control with his superior firepower from the baseline but Berankis hurt the 20 year old American with wide, angled shots near the sidelines, which seemed to take advantage of the far physically larger player's movement. Sock smashed a stick late in the second set to vent his frustations but he could not stop the bleeding. On the positive side for Sock, he was dominant when the rallies were from the center of the court area and his heft on each wing and serve is enough to trouble any player. Also, Sock did rebound to win a doubles match with James Blake. Gulbis vs. Querrey was a heavyweight slugfest. Both players practiced before the match on adjacent courts to each other. Querrey was with his pal Isner and the atmosphere during Q's warmup was light with quite a few smiles and chuckles.The mood on Gulbis' court was a stark contrast. Gulbis was deadly serious and all business, hitting every ball with a laser concentration. He was hitting extremely hard too. During breaks, his partner Bjorn Phau sat by himself in a folded chair near the umpire stand. Gulbis moved his seat about 20 feet away, facing straight across the service line with his back to the short side fence and Querrey, who was hitting behind him. Gulbis did not talk at all with Phau. He was in kill mode. Just in case his demeanor didn't deliver the message, Gulbis' blue adidas shirt did: "...Attack Destroy."Gulbis lost a close match to ATP #19 Querrey recently and this was a chance for revenge. The first set was hard fought but Gulbis edged it by lunge returning a wicked Querrey serve on set point which blooped near the right service line corner. Q hustled to the ball but misfired a big forehand long to lose the set 4-6. Gulbis went down a break in the second but gamely fought back, twice earning 0-30 leads on Q's serve late in the second. But Querrey battled back with four straight service winners to go up 5-3. Gulbis had to fight hard to hold and had Q in trouble again at 4-5 but Q hung tough and won the second, yelling out a loud "Come on." I had to leave at this point, learning later Sam built a 4-0 lead only to lose the match in a third set TB. I am not surprised by this result in the least, as it was very clear Gulbis has a newfound desire and hunger which emanates an almost Nadal like intensity. This is an enormous statement kind of win for Gulbis, shortly after making the controversial comment a few days ago that he feels there are some players in the top 100 now who "don't know how to play tennis."Gulbis advances to the quarterfinal where he will meet the surprising lefty Daniel Munoz De La Nava of Spain, who has defeated Donald Young (qualies), Ryan Harrison and #8 seed Xavier Malisse in three sets today.Berankis, who lost in qualies to Bobby Reynolds, replaced injured Feliciano Lopez in the main draw and will face Ed Roger-Vasselin in his quarter.