KEY BISCAYNE, Fla. Alec Ogletree Jersey . - Even with his surgically repaired back still nowhere near perfect, defending champion Andy Murray needed only 73 minutes to beat Jo-Wilfried Tsonga 6-4, 6-1 at the Sony Open on Tuesday and set up a quarterfinal with Novak Djokovic. "My game is getting there," said Murray, the No. 6 seed, who acknowledged he was dealing with a sore back. "The last six sets Ive played, very high-level tennis, very few errors." Hell need to keep it that way against Djokovic, who eased past Tommy Robredo 6-3, 7-5. The second-seeded Djokovic even gave back a point in the second set. A groundstroke from Robredo clipped the baseline and Djokovic couldnt handle it, but the ball was erroneously called out. After a review showed the ball was in, the point was ordered to be replayed. Djokovic shouted "Its OK, its OK" as the fans applauded his sportsmanship. "For me, its something that is part of the sport, fair play," Djokovic said. "I expect everybody else to do the same. Of course, not everybodys the same, but for me, thats something thats normal. Just a normal, natural reaction." Top-seeded Rafael Nadal downed 14th-seeded Fabio Fognini 6-2, 6-2. Nadal has dropped a total of nine games in six sets so far in this tournament. Singles players with a combined 66 Grand Slam victories were in action Tuesday, including Roger Federer — a winner of 17 of them himself. And he looked very much like the Federer of old, needing only 49 minutes to beat ninth-seeded Richard Gasquet 6-1, 6-2. "Look, things went well out on the court today," Federer said, clearly understating matters. Federer, the No. 5 seed, had 25 winners to Gasquets eight, converted five of his six break chances and won 92 per cent of his first-serve points in the second set. Next up for Federer is 20th-seeded Kei Nishikori, who upset No. 4 David Ferrer 7-6 (7), 2-6, 7-6 (9). Ferrer had beaten Nishikori in the same round at Key Biscayne a year ago, their most recent meeting before Tuesday. No. 22 Alexandr Dolgopolov of the Ukraine also pulled off an upset, topping third-seeded Stanislas Wawrinka 6-4, 3-6, 6-1 to reach the quarterfinals. The last American in the mens draw was ousted when 10th-seeded John Isner lost to No. 7 seed Tomas Berdych 6-3, 7-5. On the womens side, Maria Sharapova rallied from a break down in the first set to oust Petra Kvitova 7-5, 6-1 and earn a spot in the semifinals. Shes been a finalist at Key Biscayne five times, but never the champion. "I love the energy here," she said. The fourth-seeded Sharapova, who needed three-setters to get through her two most recent matches at Key Biscayne, feasted on 30 unforced errors by the eighth-seeded Kvitova. Sharapova won 11 of the final 13 games and moved into a semifinal matchup with Serena Williams, the defending champion who won 62 of 100 points in her 6-2, 6-2 romp over fifth-seeded Angelique Kerber. Williams broke Kerber twice in each set, faced only one break point and held a more than 2-to-1 advantage in winners. "When youre playing champions, you like to play your best," Williams said. "She always gives me her best. ... I love playing her. I really do. It doesnt matter what surface. Shes one of my favourite people to play." Sharapova said she was eager to face Williams again. "Its no secret that shes been a big challenge of mine, an opponent that obviously I would love to beat," Sharapova said. Also, former No. 1 Martina Hingis teamed with Sabine Lisicki to reach the doubles quarterfinals. And foot and vehicle traffic outside the tennis centre was briefly halted during the night session when a suspicious backpack was found near the main gate, but Miami-Dade police responded and quickly determined there was no threat. Lorenzo Carter Jersey . Alen, 28, hit .315 with five home runs, 59 RBI and a career-high nine stolen bases for the Goldeyes last season. He is the longest serving catcher in Goldeyes history, having already spent five seasons with the organization. Ray-Ray Armstrong Jersey . This week they discuss the Philadelphia 76ers, Gregg Popovich, Royal and Ancient Golf Club and Bill Belichick. http://www.giantsrookiestore.com/Giants-Riley-Dixon-Jersey/ . PETERSBURG, Fla.CHARLOTTE, N.C. -- Free-agent point guard Brian Roberts has agreed to a $5.5 million, two-year deal with the Charlotte Hornets, according to a person familiar with the contract. The person spoke to The Associated Press on Sunday on condition of anonymity because the deal has not yet been made public. The person said the deal will be signed this week. The 6-foot-1, 173-pound Roberts will backup Kemba Walker. Roberts replaces Luke Ridnour, who was the teams backup point guard last season. Entering his third NBA season, Roberts has started 47 career games and averaged 8.2 points and three assists in 19.9 minutes per game. He started 42 games last season for the New Orleans Pelicans, averaging 9. Will Hernandez Giants Jersey. 4 points and 3.3 assists. Yahoo Sports was first to report the agreement. Roberts, 28, went undrafted in 2008 and spent his first four years of professional basketball playing in Europe. The Hornets also announced Sunday they have traded guard Scotty Hopson to New Orleans in exchange for cash considerations. Charlotte acquired Hopson on Saturday, along with cash considerations, from the Cavaliers to complete a draft night trade that sent centre Brendan Haywood and the rights to forward Dwight Powell, the 45th overall pick in the 2014 NBA Draft, to Cleveland. 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