RIO DE JANEIRO -- What happened out there?Serena Williams possesses what is arguably the most dominant stoke in the history of womens tennis: a powerful serve that has led her to 22 Grand Slam singles titles and Olympic gold in 2012. But Tuesday night in Rio, just when she needed it most, her serve looked like it belonged to a rank amateur playing a weekly round-robin at the local public courts.Time after time it happened: Her tosses wobbled in the air, and when her racket arm clunked into position it looked like her Wilson racket carried 20 pounds of extra weight. There was one uncertain double fault. Then another. Then, a little while later, another. Five double faults in one game, including one she barely managed to push into the net, leading to a break of serve that led to a three-game run of ungainliness that closed out the match.At the end of this 6-4, 6-3 third-round loss to 21-year-old Elina Svitolina, Williams game had vaporized into the warm Brazilian night. She was trying, but some in the crowd booed as if she wasnt. Others sat stone-faced, eyes wide, shocked at Williams loss of confidence, her 37 unforced errors and the sight of a supreme athlete looking lost on an Olympic stage.Was an injury the cause of it? She dropped out of the Montreal tour stop last month, citing shoulder concerns. But shes not saying, partly because shes not exactly saying much. When the match was done, Williams, the top seed, didnt make herself available to answer questions from the assembled media. Instead, she spoke into a recorder to a United States Tennis Association communications manager, who relayed to the media corps a short string of quotes.Its obviously disappointing but, you know, she played really well, and I think the better player today won, Williams said. It didnt work out the way I wanted to, but at least I was able to make it to Rio.It was awesome. It was fun. But its over now.Uh, yeah. That doesnt exactly give us much. It was Serena being Serena, which is why she is one of the most hot-button champions of our time.Make no mistake, from the start Svitolina dictated the terms of this match. Her forehand was simply dominant. She did not make many unforced errors. Importantly, before Williams meltdown, Svitolina did not back from the fight.The feeling is unreal. I still cant believe this match ended with a win for me, said the Ukrainian, who has risen to No. 20 in the world and is getting coaching help from retired Belgian great Justin Henin.Svitolina spoke of the importance of staying in the moment. How she kept on reminding herself, Dont play Serena Williams, Olympic champion and so many Grand Slams. Just play the ball and go for it.And so we have another stunner. Another top seed down. The Olympics can be rough ground for the top ranked players. Just ask Roger Federer, who has never won singles gold. Or world No. 1 Novak Djokovic, himself bereft of gold, the loser in a raucous upset Sunday night to Juan Martin del Potro.Part of it is that Olympic tennis is still trying to establish its importance. Motivation among the top players can wane; losing here hurts, but for most its not likely to sting as much as losing in a Grand Slam.This tournament just means more to the lesser-known players like Svitolina. For me, she said, the Olympics is the most special. Win the gold medal here, and she becomes a national hero in her Ukraine, no doubt.Less certain is whats happening with all of pro tennis right now. This match exposed the openings that seem to be spreading through the top of both the mens and womens games in 2016. Serena won Wimbledon but looked uncharacteristically befuddled in the finals of the Australian Open and French Open. Combine those results with Rio -- then consider her age and the upset she suffered in last years US Open semifinals against Italian Roberta Vinci -- and she seems far from a lock for taking Grand Slam No. 23 at next months event in Flushing Meadows.And what of the men? Djokovics upset loss here comes on the heels of being knocked from Wimbledon by journeyman Sam Querrey. With 35-year-old Federer off the tour for the remainder of 2016 because of injury, one has to wonder if theres an opening for someone else to make a sustained run at the top ranking that has been dominated by Djokovic for the past five years.Maybe itll once again be Andy Murray, who looks supremely confident after winning Wimbledon. He had an easy 6-3, 6-1 win Tuesday against Juan Monaco of Argentina. Maybe itll once again be Rafael Nadal, who looked very much his old self, beating Italys Andreas Seppi 6-3, 6-3. (Though two matches are not enough to judge someone who has been struggling through a year-long battle with injury and confidence woes.)Maybe itll be someone else. A few young talents are out there. Milos Raonic? The Wimbledon runner-up is one of them, though it would have been nice if hed bothered to show up in Rio. Nick Kyrgios is another. No doubt he has the talent, but his win last week in Atlanta cant cover up the fact that Tennis Australia declined to bring him to the Olympics because of his unpredictably awful behavior.Openings like this at the top havent come often in the most recent era of pro tennis. Then again, neither have performances as ungainly as those by Rios two No. 1-seeded players. Jordan 9 For Sale Cheap . The 19-year-old Olsen played 34 games with the Kelowna Rockets of the WHL this season. In that time, hes recorded 17 goals and 17 assists with 36 penalty minutes. 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McCarthy, a player who played some games in the second tier for Wigan at the start of this season, would go on to shine inside Evertons midfield, outplaying the man he was brought in to replace, on one of the grandest stages in English football. On Saturday, it was fitting that Manchester Uniteds most recent dagger into the chest was delivered by Frenchman Yohan Cabaye, a wonderfully gifted central midfielder who put on an outstanding effort for Newcastle at Old Trafford.Premier League managers work with some of the top players in world football - but were they any good in their day? From European Cup and league title winners to one manager who only played at university, theres a diverse range of experience among the top-flight bosses. Weve taken a look at the playing achievements and ability of the current Premier League managers and ranked them. Read on to see who ranks where... 1) Ronald Koeman - EvertonA glittering career at both club and international level, Koeman began his career with success in the Eredivisie at Ajax and PSV between 1983-89, winning the European Cup in 1988 with the latter, before going on to achive similar success with Barcelona, winning Europes premier prize again in 1992. Watch NOW TV Watch Sky Sports for just ￡6.99. No contract. Hes also the only current Premier League manager to have won a major international honour, having been part of the Netherlands side that won the European Championship in 1988. Koeman twice won the European Cup and helped Netherlands to European Championship glory Honours:Eredivisie (4): 1984/85, 1986/87, 1987/88, 1988/89KNVB Cup (3): 1985/86, 1987/88, 1988/89La Liga (4): 1990/91, 1991/92, 1992/93, 1993/94Copa del Rey (1): 1989/90Supercopa de Espana (3): 1991, 1992, 1994European Cup (2): 1987/88, 1991/92UEFA Super Cup (1): 1992International career:78 caps (14 goals) for NetherlandsEuropean Championship (1): 19882) Pep Guardiola - Manchester CityBefore becoming the most sought-after manager in Europe, Guardiola forged a hugely successful and trophy-laden playing career with Barcelona from 1990-01.The Spaniard won leagues and cups galore, including a European Cup triumph in 1992, before going on to feature for Brescia, Roma and Al-Ahli in the closing stages of his career. At international level he featured at the 1994 World Cup and Euro 2000, and won Olympic Gold in 1992. Guardiola was a key player for Barcelona, winning six La Liga titles and one European Cup Honours: La Liga (6): 1990/91, 1991/92, 1992/93, 1993/94, 1997/98, 1998/99Copa del Rey (2): 1996/97, 1997/98Supercopa de Espana (4): 1991, 1992, 1994, 1996Segunda Division B (1): (1990/91)European Cup (1): 1992UEFA Cup Winners Cup (1): 1996/97UEFA Super Cup (2): 1992, 1997International career:47 caps (5 goals)Olympic Gold Medal (1): 19923) Mark Hughes - Stoke Hughes had a glittering career in England with Manchester United and Chelsea, winning a host of domestic and European honours, and also played on the continent for Barcelona and Bayern Munich.At international level, the Stoke boss is in the top 10 for caps and goals for Wales, but never got a chance to play in a major tournament. Wales ace Mark Hughes twice won the Premier League and lifted the FA Cup four times Honours:Premier League (2): 1992/93, 1993/94FA Cup (4): 1984/85, 1989/90, 1993/94, 1996/97League Cup (3): 1991/92, 1997/98, 2001/02Charity Shield (3): 1990 (shared), 1993, 1994UEFA Cup Winners Cup (1): 1990/91UEFA Super Cup (1): 1991International career: 72 caps (16 goals) for Wales4) Antonio Conte - ChelseaA legend at Juventus, Conte made more than 400 appearances as a central midfielder for the club after switching from Lecce in 1991. The Chelsea manager played for 13 years in Turin, winning pretty much every major trophy in the game.At international level he made 20 appearances for Italy, but could only finish as a runner up twice in the 1994 World Cup and Euro 2000. Antonio Conte won five league titles and the Champions League with Juventus Honours:Serie A (5): 1994/95, 1996/97, 1997/98, 2001/02, 2002/03Coppa Italia (1): 1994/95Suppercoppa Italiana (4): 1995, 1997, 2002, 2003Champions League (1): 1995/96UEFA Cup (1): 1992/93UEFA Super Cup (1): 1996Intertoto Cup (1): 1999Intercontinental Cup (1): 1996International career:20 caps (2 goals) for Italy5) Aitor Karanka - MiddlesbroughKaranka spent most of his career in Spain, featuring for Athletic Bilbao and their B Team before moving on to Real Madrid in 1997. He spent five years largely as a back-up player at the Bernabeu, but managed to pick up a haul of major trophies while there - including three Champions League winners medals.At international level he won a single cap for Spain in a European Championship qualifier against Armenia in 1995. Three-time Champions League winner Aitor Karanka playing against Leeds in 2001 Honours: La Liga (1): 2000/01Supercopa de Espana (2): 1997, 2001Champions League (3): 1997/98, 1999/00, 2001/02Intercontinental Cup (1): 1998International career:1 cap (0 goals) for Spain Mboro vs Chelsea November 20, 2016, 3:30pm Live on Get Sky Sports Get a Sky Sports pass 6) Mauricio Pochettino - TottenhamPochettino started his career in Argentina with Newells Old Boys. He moved to Spain with Espanyol before enjoying spells in France with Paris Saint-Germain and Bordeaux before ending his career back in Spain at Espanyol.At international level he played for Argentina at the 2002 World Cup, featuring in all three games as they exited at the group stage. Pochettino gave away a penalty when Argentina played England at the 2002 World Cup Honours: Argentine Primera Division (1): 1990/91Clausura (1): 1992Copa del Rey (2): 1999/00, 2005/06International career:20 caps (2 goals) for Argentina7) Claude Puel - SouthamptonPuels playing career started at Castres FC. He was then spotted by AS Monaco, joining the club in 1977. He spent his entire career at Monaco, playing 601 times for the club.Honours: Ligue 1 (2): 1981/82, 1987/88Coupe de France (3): 1980, 1985, 1991Trophee des champions (1): 1985Coppa delle Alpi (3): 1979, 1983, 19848) Slaven Bilic - West HamBilic spent time in England with West Ham and Everton but most of his playing career was with Hajduk Split, where he won several trophies. He was capped 44 times by Croatia and was part of the team that finished third at the 1998 World Cup in France. Former West Ham player Slaven Bilic helped Croatia finish third at the 1998 World Cup Honours:Yugoslav Cup (1): 1990/91Croatian First League (1): 1992Croatian Cup (2): 1992/93, 1999/00International career: 44 caps (3 goals) for Croatia9) Mike Phelan - Hull CityA regular in the lower leagues with Burnley and Norwich, Phelan helpped the latter to promotion before switching to Manchester United in 1989.ddddddddddddHe then spent five years at Old Trafford where he won domestic and Eu