PGA Tour Golf, World Cup of Darts, Royal London Cup Cricket, GAA Football, Greyhound Derby - its all live on Sky Sports this weekend. There is no shortage of excitement in store this weekend and you wont miss a moment of sizzling summer action on Sky Sports...Will Jason Day, Jordan Spieth or Rory McIlroy emerge victorious? Rory McIlroy and Jordan Spieth battle it out for the Memorial What: Memorial Tournament on the PGA TourWhen: LIVE NOW and Sunday from 5pmWhere to watch: Sky Sports 4 HDCan England defend oche crown? Phil Taylor of England will be out to keep hold of Englands World Cup trophy What: World Cup of DartsWhen: LIVE NOWWhere to watch: Sky Sports 1 HDCan Somerset overcome Gloucestershire? 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OXNARD, Calif. -- Jerry Jones says he learned a lesson last year building his hopes around the return of missing stars when the Cowboys tumbled to 4-12 in a season marred by injuries to Tony Romo and Dez Bryant.That doesnt mean the Dallas owner is ready to dump Rolando McClain even though the enigmatic linebacker will be suspended the first 10 games on a substance-abuse violation, stayed away from the team most of the offseason and hasnt reported to training camp in California.There are many nuances that, basically, would mitigate that clean a shot, right there, Jones said Friday on the eve of the first practice of camp. I dont even want to start down them because some of them compromise our team or compromise other aspects of it.Jones figures he helped compromise the Cowboys last year when they were defending NFC East champions before losing Romo to a fractured left collarbone a week after his star receiver, Bryant, broke his right foot in the opener.Dallas didnt win a game without the injured duo -- losing seven straight minus Romo -- yet still believed it had a shot after winning in Romos return. A blowout loss to Carolina on Thanksgiving, when Romo broke the same collarbone again, ended most of those hopes.And Jones says he wont harbor such dreams again.We got a doctors degree in it. We went to Harvard Business School over it, Jones said at his annual pre-game news conference. Living in `Theyre coming back next week or next month doesnt work. You dont win but four games doing that in the NFL, so were not going there.Jones maintains that the Cowboys were prepared for the offseason suspensions that claimed three projected starters in McClain and young defensive ends Randy Gregory and DeMarcus Lawrence, who got matching four-game bans.All three were disciplined under the substance-abuse policy, and Gregory is facing a longer suspension over another failed test.So Jones emphasized the positive as much as he could before yielding to what he knew would be a wave of questions that werent.We are not going to let a few setbacks, a few notable setbacks, deter the fact that we are fortunate, Jones said. We have many assets and were going to put them on the playing field and win ballgames with them.McClain and Gregory were headed for the reserve-did not report list, with Gregory skipping cammp while in drug rehab.dddddddddddd Jones has said he doesnt expect Gregory to be in California. Lawrence reported for camp but is likely to be limited early after offseason back surgery.All three are eligible for preseason work, including games. The suspensions dont start until the first week of the regular season.Meantime, the Cowboys arent too keen on suggestions that theyve become oblivious to issues of character.Are we always right? No, coach Jason Garrett said. One of the jobs we have is to provide the right structure, the right assistance to bring out the best out in guys. Its always a work in progress. But I love the culture of our team. I love the character of our team.Besides Romo and Bryant, the Cowboys are expecting a boost from cornerback Orlando Scandrick, who sat out last season after tearing two ligaments in his right knee late in camp. A defense that struggled to make game-changing plays missed his edgy persona as much as his playmaking.But the pass rush was a question even before the Cowboys lost Gregory and Lawrence to suspensions. They didnt address the rush end spot until the third round in the draft (Oklahomas Charles Tapper), but did lure Benson Mayowa away from Oakland on an offer sheet.Dallas also tried to shore up its interior defensive line by signing Cedric Thornton away from division rival Philadelphia.The whole defensive line is going to be, to me, very interesting to watch, executive vice president of personnel Stephen Jones said. We like what we see there and we think we have some good young players who have a chance to step up.Game notes The Cowboys will start camp with three players will be on the non-football injury list, including two on freak accidents. RB Darren McFadden broke an elbow trying to save a dropped cellphone this spring, and LB Damien Wilson injured an eye in a paintball accident about a week before camp. ... Four players are headed to the physically unable to perform list: Mayowa (knee), LB Lance Dunbar (knee), rookie DT Maliek Collins (foot) and TE James Hanna (knee).---Online:AP NFL websites: www.pro32.ap.org and www.twitter.com/AP-NFL---Follow Schuyler Dixon on Twitter at https://twitter.com/apschuyler ' ' '