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Day 4 Scores
No. 1 David Ferrer def. Jack Sock; 4-6, 6-3, 6-1
No. 2 Milos Raonic def. Joachim Johansson; 6-2, 7-6 (3)
Kenny De Schepper def. No. 4 Kevin Anderson; 7-6 (5), 4-6, 6-3
No. 5 Ernests Gulbis def. Igor Sijsling; 6-3, 7-6 (3)
No. 7 Grigor Dimitrov def. Jan-Lennard Struff; 6-1, 6-3
Fernando Verdasco def. Jarkko Nieminen; 6-2, 3-6, 6-3
Jack Sock gave top seed David Ferrer all he could handle in Stockholm during Thursday's Round 2 action, taking the first set by a score of 6-4.
The 21-year-old American took advantage of his superior power on both groundstrokes and serves against Ferrer on the hard-court surface, staying aggressive and applying the pressure to his heavily favored foe.
Unfortunately, that strategy backfired when Sock became more erratic, and won just seven of 15 service points in the deciding third set.
It was still an encouraging result for Sock, who flashed some of the promise that has him tabbed as a possible star in the making.
A big upset occurred when the ATP's No. 96-ranked player Kenny De Schepper topped tournament fourth seed Kevin Anderson in three sets.
The match of dueling 6'8" players featured a combined 33 aces, but the unseeded underdog was just a bit better. He won 107 total points to Anderson's 105.
Spanish veteran Fernando Verdasco continued his stellar form by topping 2011 runner-up Jarkko Nieminen, but he has to face Ferrer in the impending quarterfinals.
Grigor Dimitrov was the only one among the top-seeded players who had a rather drama-free experience on Day 4, rolling in straight sets in his second-round match versus Jan-Lennard Struff.
No. 5 seed Ernests Gulbis needed a tiebreaker in the second set, but had relatively little trouble in ousting Igor Sijsling. A similar scenario applied to second seed Milos Raonic, but he still advanced against qualifier Joachim Johansson in the final match on centre court.