Gavin Sheehan has been pencilled in to ride Black Thunder in the Crabbies Grand National at Aintree on Saturday.Sheehan is poised to competitively link up with champion trainer Paul Nicholls for the first time after having partnered the nine-year-old in a workout at Wincanton last week.The only caveat behind the jockey booking is the fact Black Thunder is due to be put up for auction at the Goffs UK Aintree Sale on Thursday evening. Nicholls will saddle five other horses - Unioniste (Nick Scholfield), Wonderful Charm (Sam Twiston-Davies), Silviniaco Conti (Noel Fehily), Just A Par (Sean Bowen) and Rocky Creek (Andrew Thornton) - in the National.The Ditcheat handler told the Daily Telegraph: It will be Gavins first ride for me, but he rode him in work during the week at Wincanton.It just depends if the horse gets sold and what they want to do. A lot can still happen.They have all schooled over the National fences and it was all good.The main one is Conti, hes a seven-time Grade One winner, hes very well and trained for the race.Unioniste has done well, hes a much better horse than he was last year, if he ran well it would be no surprise.Nicholls is aiming for a 10th trainers championship as the season reaches its climax, but is fearful of Willie Mullins, who looks like sending to Aintree an ultra-strong raiding party.At the end of the day if Willie runs all those horses, weve got no chance, Nicholls said.But by the start of Thursday we might be £250,000 in front, I suppose we might get that again by the end of the season, which means Willie has got to win £500,000. He could get that, but it makes it interesting.Im not going to change targets and run them everywhere. There is plenty of other good prize-money left at Cheltenham, Sandown, the Scottish National meeting anyway. 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Neymar curled home a free kick from just outside the area to put the 2014 World Cup host ahead in the 44th minute. Three minutes after the break, a simple through pass from Paulinho freed Oscar and the Chelsea star rounded goalkeeper Jung Sung-ryong to extend Brazils lead.Odell Beckham Jr. is one of the NFLs top wide receivers. Josh Norman is one of the games top cover corners. The Giants and Redskins play each other this week. This can only mean one thing: a full-on, head-to-head battle from start to finish.Although thats the likely scenario here in Week 3, top-end receiver/corner showdowns rarely follow that script. There are only a handful of cornerbacks who shadow No.1 receivers most weeks, and you can count on one hand those?who shadow both the perimeter and the slot.By analyzing each and every snap, we can best project how each defense will attempt to slow the opposing teams wide receiver. Presented in no particular order, below is a list of the leagues top cover corners and a breakdown of how each is utilized.Note: Each week, I examine the top wide receiver/cornerback fantasy matchups, including projections of each and every shadow situation. Also included is the weekly WR/CB matchup cheat sheet, which shows the usage of the top three wide receivers and corners for each team.Josh Norman, Washington RedskinsShadows often, but only the perimeterWhere else to start but with the man of the hour? Normaan is ticketed for shadow coverage against Beckham in Week 3, but that doesnt mean the CB will follow the opponents top wide receiver each and every week.dddddddddddd When Norman played for Carolina last year, he shadowed DeAndre Hopkins, Vincent Jackson, T.Y. Hilton, Dez Bryant, Brandin Cooks, Julio Jones (twice), Mike Evans and, of course, Beckham. Norman infamously did not shadow Antonio Brown earlier this season, but did follow Bryant during part of the Week 2 meeting with Dallas.Some simple math tells us that Norman has shadowed during roughly half of his games over the past two seasons. Additionally, Norman almost never covers the slot. Last season, he lined up inside on a grand total of 10 pass plays. This may not matter against the Giants this week (Beckham has lined up in the slot 7 percent of the time this season), but it will surely allow the likes of Jordan Matthews, A.J. Green, Stefon Diggs and Larry Fitzgerald to avoid full-on shadow coverage later this season.Richard Sherman, Seattle Seahawks ' ' '