RIO DE JANEIRO -- Novak Djokovic shook his head and placed his palm over welling eyes on his way to the locker room after a first-round Olympic exit, devastated he might never realize his goal of adding a gold in singles to a substantial collection of Grand Slam titles.I mean, no doubt, its one of the toughest losses in my life, in my career, Djokovic said later, shaking his head and speaking in subdued tones. Not easy to handle.The Serb was hardly alone in his disappointment on Day 2 of the Rio de Janeiro Games: He was one of three No. 1 seeds to exit the tennis competition in a wild span of 12 hours.Djokovics 7-6 (4), 7-6 (2) setback Sunday night was caused in large part by ferocious forehand after ferocious forehand from a resurgent Juan Martin del Potro of Argentina. That surprising result followed losses by the top-seeded duos of Serena and Venus Williams of the United States -- who entered their match with a 15-0 Olympic record and three gold medals as a pair -- in womens doubles, and Nicolas Mahut and Pierre-Hugues Herbert of France in mens doubles.The second-seeded mens doubles duo of Andy and Jamie Murray departed, too.Got to take it on the chin, said Jamie, the older brother of two-time Wimbledon winner Andy, and move on.Sunday began with 25 mph winds that delayed the start of play on eight of Rios nine tennis courts for about 2 hours, and then came so many startling outcomes.None was more significant than 2009 U.S. Open titlist del Potros victory over 12-time major champion and No. 1-ranked Djokovic in a thriller before a raucous crowd. The match concluded with both men, who are friends, wiping away tears after a lengthy, warm embrace at the net, during which Djokovic offered what del Potro described as really kind words.Del Potro has dealt with three operations to his left wrist that kept him off the Grand Slam circuit for 2 1/2 years, until Wimbledon last month, and even he acknowledged: I didnt expect to beat Novak tonight.Djokovic had won seven of their eight most recent meetings, and 11 of 14 overall, before Sunday. But this is the second time that del Potro came out ahead at an Olympics: He beat Djokovic to take the bronze medal in London four years ago.Representing Serbia means a lot to Djokovic, who led his country to a Davis Cup title and carried its flag at the opening ceremony of the 2012 Games. He did earn a bronze at the 2008 Beijing Olympics, but to a guy with so much success, anything other than being the champion is not acceptable.There is still a shot at gold in doubles in Rio -- he and Nenad Zimonjic are into the second round -- but as for singles, Djokovic will be 33 by the time Tokyo hosts the 2020 Olympics.The wounds are still fresh, Djokovic said. But youve got to deal with it. Its not the first (or) the last time that Im losing a tennis match. But Olympic Games, yeah, its completely different.This comes a little more than a month after a third-round loss at Wimbledon against Sam Querrey of the United States, and could add to the sense that Djokovic is not as unbeatable as everyone was beginning to think he was when he won the French Open in June to become the first man in nearly a half-century to win four consecutive major trophies.With Djokovic out of the draw, 2012 gold medalist Andy Murray, who is seeded No. 2, becomes the favorite as he bids to become the first player to win consecutive Olympic singles titles. He won his opener in that event Sunday, 6-3, 6-2 against Serbias Viktor Troicki.Also chasing a repeat in singles: Serena Williams, who was the only No. 1 seed with a victory Sunday, albeit a patchy one, 6-4, 6-2 against Australias Daria Gavrilova in singles.Then Serena went back out on court to partner Venus, who has been ill and lost in singles on Saturday. They were beaten 6-3, 6-4 by the Czech Republics Lucie Safarova and Barbora Strycova.We played terrible, Serena said, and it showed in the results.A common theme on this day.After he and Jamie wasted five set points in the second tiebreaker of their 7-6 (6), 7-6 (14) loss against Brazils Thomaz Bellucci and Andre Sa, Andy said he would skip mixed doubles and let his brother play with Jo Konta.Ill concentrate on the singles now, Andy said. Ill get a day off tomorrow and recover. Its been a long day.---Follow Howard Fendrich on Twitter at http://twitter.com/HowardFendrichCheap Ultra Boost China . Newcastle dominated in the early stages but City weathered the storm and then raised its game in extra time. Negredo broke the deadlock from close range after a simple move in the 99th minute before Dzeko took the ball round goalkeeper Tim Krul to seal the victory in the 105th. Ultra Boost On Sale . - Connor McDavid scored 53 seconds into overtime as the Erie Otters came from behind to defeat the visiting Guelph Storm 4-3 on Saturday in Ontario Hockey League action. http://www.cheapultraboostshoes.com/ . Durant finished with 24 points and 13 rebounds, Jackson matched his career high with 23 points on 10-of-14 shooting and Lamb scored 12 points on 5-of-7 shooting, lifting the Thunder to a 94-88 win over San Antonio and snapping the Spurs 11-game winning streak. Cheap Ultra Boost Shoes . The 15th-ranked Canadian men lost the opening two games of their European tour: 19-15 to No. 17 Georgia and 21-20 to No. Adidas Ultra Boost 2018 . Jeff Green scored 13 points and Kris Humphries 12 for the Celtics, who nearly blew an 18-point, second-half lead. Sullingers 20-20 was the first by a Celtics player since Kevin Garnetts first game in Boston in 2007. Garnett was dealt -- along with Paul Pierce -- to Brooklyn during the off-season.England 255 for 6 (Root 89, Morgan 68) beat Pakistan 251 (Sarfraz 105, Imad 63, Woakes 3-42, Wood 3-46) by four wicketsScorecard and ball-by-ball detailsJoe Roots fourth successive half-century in ODI cricket eased England to a deceptively comfortable four-wicket win over Pakistan at Lords.While Root fell just before the victory line - and just before he could record equal Kevin Pietersens record of nine ODI centuries (only Marcus Trescothick, with 12, has more for England) - he had done enough to assure England of victory with 15 balls to spare. They take a 2-0 lead in the five-match Royal London series and a 12-8 lead in the Super Series.While this game was not a rout in the sense of Wellington 2015 (where New Zealand thrashed England by eight wickets with an eye-watering 226 balls remaining), or Edgbaston 2016 (when England defeated Sri Lanka by 10-wickets) it never really threatened to be the contest on a glorious summers day and full house crowd deserved.A Pakistan team branded behind the times by their coach, Mickey Arthur, the day before the game was reduced to 2 for 3 within the first 19 deliveries and, despite a tremendous century from Sarfraz Ahmed, never fully recovered. Their final total of 251 was well below par on a very good surface for batting.While England lost two early wickets - Jason Roy, who played on having driven without sufficient foot movement, and Alex Hales, who snatched at a sweep shot - Root and Eoin Morgan added 112 in 21.3 overs to break the back of the challenge. Root, without ever having to move into top gear, than marshalled the chase with impressive maturity. So comfortable was Englands chase that, once Root had reached 14, he did not strike another boundary until he had made 75. There were, in all, 53 singles in his innings. While it was impressively controlled, you sensed spectators may have yearned for more drama.The tone for the day had been set in the early moments. After Pakistan were quickly made to regret their decision to bat first on a green surface - a decision that pleased Eoin Morgan, the England captain, who admitted he would have chosen to bowl first anyway - Sarfraz was obliged to adopt a measured approach to his rebuilding operation.Pakistans first three batsmen could only manage one run between them. If Sami Aslam could count himself slightly unfortunate to be given out caught behind down the leg side - the on-field umpire, Marais Erasmus, originally gave him not out, but the TV umpire, Simon Fry overruled on the basis of a spike in the snickometer even though there was no Hot Spot - the other two batsmen were the recipients of fine deliveries.Mark Wood produced a beauty, pitching on leg stump and swinging late, to take the off stump of Sharjeel Khan, before Chris Woakes bowled one that nipped away down the slope and bounced to take the edge of Azhar Alis bat.But Sarfraz, with his second ODI century, posted half-centuryy partnerships for the fourth, fifth and sixth wickets.ddddddddddddHaving also made a half-century in the first ODI in Southampton, he recorded his highest ODI score here, overtaking his unbeaten 101 against Ireland at Adelaide during the 2015 World Cup, as well as recording the highest score made by a Pakistan wicketkeeper in an ODI in England. It was also the first century by a Pakistan batsman in an ODI at Lords. The previous highest was 88, made by Mohammad Yousuf against Australia in 2004. There were 61 singles in his innings.While Sarfraz took a couple of early boundaries off Wood - once driving an over-pitched ball and once pulling a short one - he was generally obliged to adopt a low-risk approach. Pakistan could not pick up a boundary for almost 11 overs once the field went back at the start of the second Powerplay, losing Babar Azam, bowled off the boot as he tried to squeeze a full ball through midwicket, in the process.While Shoaib Malik skipped down the pitch and drove Moeen Alis second delivery for six, the reintroduction of Wood brought the breakthrough. Gaining steep lift and movement from a back of a length delivery, Wood took the edge of Shoaibs bat to leave Pakistan in trouble once more at 125 for 5 in the 27th over.But Imad Wasim gave Sarfraz steadfast support and, in making his highest ODI score to date, helped add 77 in 16.3 overs for the sixth wicket. While Imad started slowly - his first 17 deliveries brought only three runs - he accelerated nicely once he had settled and took 14 off three deliveries from Liam Plunkett - a slashed six over point followed by two driven fours - at one stage.Sarfraz was reprieved by the TV umpire on 102 after Marais Erasmus had adjudged him leg before to a Plunkett slower ball. But he was unable to take advantage and succumbed to a catch on the mid-wicket boundary as he attempted a slog-sweep in the following over.While Hasan Ali was caught in the deep -Root looked in some pain after colliding with Adil Rashid in taking the catch, but was able to continue after treatment on his shins - and Wahab Riaz was brilliantly caught by Plunkett, flinging himself to his left at cover, Imad helped Pakistan take their total above 250.Perhaps the most fluent batting of the day game from Morgan. With an array of sweeps, flicks, cuts and pulls, Morgan recorded his first half-century in 13 ODI innings and his highest since November. Though he perished attempting to make room for a cut, Ben Stokes missed a horrid smear, Jos Buttler was run out by a direct hit when called for an optimistic single and Root holed out to mid-off, the sense was that England were cruising long before they reached the finish line.For Pakistan, the prospect of automatic qualification for the next World Cup is receding by the match. ' ' '