Buster Olney writes today that it won't be easy for the Astros to trade Oswalt: ---------------------------------------------------------------------------------------------------------- Roy Oswalt has asked for a trade, as Mark Gonzales reported on Friday, and rival executives see four major hurdles to any deal involving Oswalt. "A no-trade clause" -- which Oswalt has -- "doesn't become a must-trade clause," said one general manager. � Hurdle No. 1: He makes a lot of money. Oswalt is owed about $29 million between now and the end of the 2011 season. � Hurdle No. 2: Oswalt's health history. He's had back problems and has required injections in order to pitch, so there would be reason for concern about whether he could be physically able to serve out the rest of his contract. � Hurdle No. 3: Oswalt has a full no-trade clause, which means that if the Astros actually got serious offers for the right-hander, Oswalt could kill the talks. Let's just say, for example, that the Washington Nationals got very aggressive and decided they wanted to want to try to win this year, and that they agreed to a deal for the right-hander; Oswalt could step in and end the discussions, and insist that he only be traded to a team closer to his Mississippi home, like the Rangers or Cardinals or Braves. � Hurdle No. 4 (and this is a biggie): At a time when teams are coveting their young prospects like never before, it remains to be seen whether any club would be willing to surrender a package of prospects good enough to convince Astros owner Drayton McLane to swap one of his signature stars. All it takes is one aggressive team at the right time and right place to make a deal, but it remains to be seen if that team will emerge. Generally speaking, most of the executives I spoke with on Friday believe that Houston will be very hard to satisfy in an Oswalt trade. "They're not just going to give the guy away," said one GM. We'll see.