Just looking over the list of players who want in on the classic. We've already got more U.S. players than the allowed roster size. Dashes indicate the last MLB organization an unsigned player was associated with.
Barrett, Michael United States CHI Berkman, Lance United States HOU Biggio, Craig United States HOU Bonds, Barry United States SF Buehrle, Mark United States CWS Chavez, Eric United States OAK Clemens, Roger United States HOU Cordero, Chad United States WSH Crawford, Carl United States TB Damon, Johnny United States -- BOS Dunn, Adam United States CIN Fuentes, Brian United States COL Griffey, Ken Jr. United States CIN Guardado, Eddie United States SEA Halladay, Roy United States TOR Isringhausen, Jason United States STL Jeter, Derek United States NYY Jones, Chipper United States ATL Jones, Todd United States -- FLA Lee, Derrek United States CHI Leiter, Al United States -- NYY Lidge, Brad United States HOU Mauer, Joe United States MIN Peavy, Jake United States SD Pettitte, Andy United States HOU Pierre, Juan United States FLA Rollins, Jimmy United States PHI Ryan, B.J. United States TOR Sabathia, C.C. United States CLE Schneider, Brian United States WSH Sheets, Ben United States MIL Smoltz, John United States ATL Street, Huston United States OAK Teixeira, Mark United States TEX Utley, Chase United States PHI Varitek, Jason United States BOS Wagner, Billy United States NYM Wells, Vernon United States TOR Willis, Dontrelle United States FLA Wright, David United States NYM Young, Michael United States TEX Zito, Barry United States OAK