Liverpool goalkeeper Loris Karius heads into one of the biggest matches of his career confident in his position as Jurgen Klopps first choice. The German has taken over from long-time No 1 Simon Mignolet for the last three games, but the visit of Manchester United on Monday, live on Sky Sports 1 HD, represents the former Mainz players biggest challenge to date.And the 23-year-old insists there is no ill-will between him and Mignolet, who in three unchallenged years in the team failed to properly establish himself beyond doubt. Its not about being best friends but we get on well, Karius said of Mignolet. On the pitch, we know we are rivals but that doesnt mean you wish anything bad on the other. Karius has started Liverpools past three matches Its very professional and all in all we are a good group. We try to help each other if there is something we can do for the other one.You prepare for the game any way so it doesnt really make a difference if you know a month before, a week before, a day before, because it wont really change anything in your training.When asked if Mondays clash with United would be the most significant outing of his career he said: Probably. With all the history of both clubs, the rivalry, its a very big match. Gary Neville and Jamie Carragher preview Monday Night Footballs Liverpool v Manchester United game Its always hard to say which is the biggest but its a really big match. Manchester United has a good, strong team but we have a great team and we play at home.We have respect for them but were not scared of them and we know we want to win the game. Well have a good plan - or more than one plan - so we will be well prepared.You can watch Liverpool v Man Utd, plus Englands tour of Bangladesh and the British Masters on Sky Sports. 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He chirped to the caddie of Brandt Snedeker about their money game, a Mickelson tradition at the majors. Lefty was in good spirits Monday at the British Open, except for having to return the claret jug.Everton boss Roberto Martinez is desperate to arrest his teams recent slump in form when they play Watford at Vicarage Road. Both teams are in need of the three points having failed to win any of their games since clinching a place in the FA Cup semi-finals last month.Everton have lost to Arsenal and Manchester United since their quarter-final win over Chelsea, while Watford also lost to the Gunners after a home defeat to Stoke since they beat Arsene Wengers side in the cup. Watfords semi-final opponents, Crystal Palace, who play Everton in midweek, have not won a top-flight match in 2016.While Everton have yet to discover their next opponents in the FA Cup, Martinez is concerned his team could lose buoyancy for that match if they do not pick up their league form. Everton manager Roberto Martinez You can work on every aspect of the game, and every technicality, but confidence comes with achieving good results and feeling good about yourself, Martinez said.Its something we need to regain with a good performance and getting back to winning ways. Its as simple as that. We need to simplify it.We should forget about the semi-final. Every team that got through to the semi-finals, they havent won a game in the league.Thats probably something that happens when you reach a real high, its difficult to reach the same llevel in the next few games.dddddddddddd Thats why we need to control the level of performance in the game against Watford. Martinez has been impressed by Watford and Quique Sanchez Flores (right) The Everton manager expects a tough encounter in Hertfordshire based on Watfords display in the 2-2 draw at Goodison in August, when he was impressed by the sharpness of Quique Sanchez Flores side.Martinez said: They are in a similar situation. First and foremost I think Watford have had an outstanding season.We faced them in the opening game of the campaign, they surprised us with how quickly they got into the tempo of the Premier League, how well organised Quique Sanchez Flores had the team, the partnership that has been so successful playing up front, and I think they are not a surprise any more.What they are doing in the cup is probably what makes it a really interesting game. Both sides are desperate to get the form into the league. Also See: Martinez: Cup hype hurting us Watford v Everton preview Mersons predictions Premier League video Fixtures Table Live on Sky Get Sky Sports ' ' '