6. Landon Donovan
John Walton/EMPICS SportSimilar to Cahill, how far can a player go in MLS? Donovan's performances for both Everton and the USMNT were at times dazzling. Still in his 20's at Everton, he could have successfully used Goodison Park as a permanent base for bigger things. If Donovan had continued his rich vein of form, teams the calibre of Dortmund and Milan wouldn't have been far away. Instead he returned to his native LA Galaxy picking up a few more titles along the way. Good but not great Mr. Donovan.