RIO DE JANEIRO -- Losing is one thing. Justin Gatlin didnt expect hed get booed at the Olympic 100-meter final, too.We all have respect for each other, the American sprinter said of his fellow competitors. Id like to see everyone have respect in the audience, as well.Gatlins doping history -- hes served two bans -- has always been a part of his rivalry with Usain Bolt. Sometimes, Bolt vs. Gatlin has even been characterized as good vs. evil.When Gatlin walked out for the 100 final in Rio de Janeiro, the boos resounded around the Olympic Stadium because of that. He said he didnt focus on them, and rather looked out at the red, white and blue U.S. flags up in the stands. But the way he scrunched up his face when the crowd bellowed at him suggests he did notice.As did Bolt.It was surprising. Ive never heard, Ive never seen it happen before, Bolt said. But I guess some people are more vocal than others.It was a bittersweet night for Gatlin -- he won a silver medal -- yet the race had been built up as a great chance for him to beat Bolt in an Olympic final. Greeted by those boos, Gatlin then saw Bolt race past him to an historic third Olympic title in the 100 meters.Surely hurting, the 34-year-old Gatlin put on a brave face.I have the utmost respect for Usain, said Gatlin, who won Olympic gold at the 2004 Athens Games and bronze four years ago in London. Away from the track, hes a great guy, hes a cool guy, there is no rivalry between us. There is no bad blood. Im a competitor, hes a competitor and he has pushed me to be the athlete that I am today. I hope he can say the same for me.Bolt did that, too.I personally think hes a great athlete, Bolt said. He shows up and pushes you to run fast and be at your best at all times. On Thursday, Jurgen Klopp and Louis van Gaal go head to head for the seventh time in their managerial careers when Manchester United look to overturn Liverpools two-goal advantage in their Europa League last-16 tie. Ahead of the meeting at Old Trafford, we examine the history of their rivalry… Louis van Gaal certainly had the better of his first Premier League encounter with Jurgen Klopp, when a late strike from Wayne Rooney gave Manchester United a 1-0 win at Anfield in January. The Dutchman called it a big step in the right direction, while Klopp was left to rue a string of missed scoring chances.It was not the first time Van Gaal has come out on top. During his time in the Bundesliga, there was the thrill of taking his Bayern Munich side to Klopps Borussia Dortmund and winning 5-1; a demolition that turned his teams season around and would eventually take Bayern to within one game of a treble. Klopp got his own back the following season, however, when Dortmund blitzed Bayern in their own backyard. It was described by Munich-based journalist Christian Eichler as a masterpiece, and one that confirmed Dortmunds rise. They went on to win the double. Van Gaal was gone within weeks. Liverpool v Man Utd Follow the game across the Sky Sports platforms with our live blog Heres the tale of their six previous matches against each other…Dortmund 1 Bayern 5 - Sep 12 2009We have to work hard in midfield and not allow them too much space, said Klopp beforehand, but while Mats Hummels opened the scoring, goals from Mario Gomez, Bastian Schweinsteiger, Franck Ribery and a Thomas Muller brace ensured an emphatic win for the visitors. Jurgen Klopps record against Louis Van Gaal P W D L GF GA 5 2 0 3 7 10 The goal by Ribery was particularly significant as the Frenchman pointedly sprinted to celebrate with Van Gaal, ending speculation about a rift between the two men. I am always pleased when a player wants to celebrate his goal with me, said Van Gaal. Franck has shown that he loves his coach.Bayern 3 Dortmund 1 - Feb 13 2010Dortmund competed for much of the match in Munich but the game ended in defeat for the visitors - a tenth in a row for Klopp against Bayern. Mohamed Zidan gave Dortmund the lead but goals from Mark van Bommel, Arjen Robben and Gomez took the game away from them. Arjen Robben escapes a Dortmund tackle as Jurgen Klopp watches on in 2010 Klopp put some of the blame on referee Knut Kircher - these mistakes do not make it more fun - but also pointed to his teams missed chances. We had several huge opportunities, he said afterwards. Still, it was a strong performance by my boys.Dortmund 2 Bayern 0 - Oct 3 2010Klopp finally got a win over Bayern and his teams sixth in a row as they punished Van Gaals men at the Westfalenstadion. Goals from Lucas Barrios and Nuri Sahin heaped the pressure on the Dutchman after a difficult start to the season. Van Gaal and Klopp ahead of the match at Signal Iduna Park in October 2010 Its high time everybody woke up, said Uli Hoeness after seeing Bayern succumb to a third defeat in seven games. Van Gaal, meanwhile, urged calm. The season is still very long, he said. It is difficult, but we must have faith. Even so, Bayerns Oktoberfest celebrations were cancelled.Bayern 1 Dortmund 3 - Feb 26 2011Dortmund chief executive Hans-Joachim Watzke had called the title talk totally unrealistic after the first match against Bayern but by February it was a very different situation. A 3-1 win in Munich, their first Bundesliga victory there in two decades, ended Bayerns hopes and put BVB on the brink. Dortmund got their first Bundesliga win at Bayern in 20 years in February 2011 Barrios scored early and while Luiz Gustavo levelled things up, goalss by Sahin and Hummels earned Dortmund the points - taking them 16 clear of Bayern.ddddddddddddThis was the youngest Dortmund side in Bundesliga history with an average age of 22 and even Van Gaal admitted they deserved to win.Liverpool 0 Manchester United 1 - Jan 17 2016Klopps first experience of Liverpool and Manchester Uniteds famous rivalry ended in bitter disappointment at Anfield. The hosts bombarded the opposition goal, having 19 shots to Uniteds seven, but they were let down by poor finishing and frustrated by David de Geas heroics. Wayne Rooney scores Manchester Uniteds winner at Anfield in January Van Gaal admitted United were second best in the first half, but they withstood Liverpools pressure before Rooney thumped home a loose ball in the 78th minute after Marouane Fellainis header had struck the crossbar. It was the strikers first goal in 11 years at Anfield. We lost a game that we should not have lost, said a rueful Klopp.Liverpool 2 Manchester United 0 - March 10 2016There was to be no repeat of Uniteds smash-and-grab victory when the sides met on the European stage for the first time in their revered histories. Having seen his side fail to convert a host of chances in January, Klopp was not disappointed as Daniel Sturridge and Roberto Firmino beat an inspired De Gea as the Reds took full control of the tie. Roberto Firmino nets against Manchester United A raucous crowd created an atmosphere to rival some of the great European nights at Anfield, and Van Gaal called upon the Old Trafford faithful to replicate the noise in the build-up to his seventh meeting with Klopp. We can also create an atmosphere [at Old Trafford] like Liverpool, The Dutchman said. So everything is possible.What does this tell us about Klopp?For Klopp, games against Van Gaal offer the contrast between chaos and control; the importance of pressing versus possession. Hell be encouraged by the knowledge that it can work but has also experienced what can happen when his team doesnt get it right.The German has had particular joy early on against his Dutch counterpart. His sides have scored within the first 10 minutes in three of their first four matches against each other and the sort of aggressive pressing witnessed in the 4-1 win over Manchester City in October could be the template. The first 30 or 35 minutes was as good as anything I can remember, not from Klopp or any Liverpool team, but in the Premier League, said Sky Sports pundit Jamie Carragher after that game. It was like the Red Arrows watching Liverpool, they were just running through people all the time.But while high-intensity pressing could give the Reds an early advantage, Januarys meeting at Anfield showed a gameplan is worthless if you cant finish your chances.What does this tell us about Van Gaal?In a sense, the series of Bundesliga games against Klopps Dortmund are a microcosm of Van Gaals problems at United. There were signs of control in the first season but what was once perceived as clinical soon came to be seen as sterile.In the season prior to Van Gaals arrival, Bayerns game against Dortmund made Bundesliga history. There were 48 shots, the most since records began, with 35 of them coming from Bayern. In the first meeting between the sides in 2010, Bayern had only 11 shots to Dortmunds 17 but won 3-1.The next time that the teams met, Bayern once again controlled possession, enjoying 62 per cent of the ball, but by this stage they couldnt find the net. The reduction in the number of chances was not seen as a factor by Van Gaal, and yet his words will feel familiar to United fans. We dominate and create four, five chances and we dont score, said Van Gaal. Dortmund dont have any chances but the first shot on goal goes in. Bayern chairman Karl-Heinz Rummenigge put it slightly differently. We have concerns, he said. We have to start to score.Curiously, though, the opposite was true at Anfield in January, when United scored with their only shot on target and Liverpool missed a host of chances. They atoned for that at the first time of asking, but that victory will be in vein if they fail to progress into the Europa League quarter-finals at the expense of their north-west rivals.ConclusionStyles make fights and if history is a clue then Klopp versus Van Gaal promises to entertain. Klopps gegenpressing or Van Gaals control?Will Manchester United leave Anfield with a first-leg lead? Or will Liverpool make their home advantage count? Let us know your prediction using the message boards or by tweeting @SkyFootball Also See: Charlies European predictions Liverpool record a boost for Utd? Group tables Bet ￡5 Get ￡20 Free ' ' '