Since I have been a fan, there have been several players with huge expectations in the Red Sox minor league system. Some of these players, such as Mo Vaughn, Nomar Garciaparra, Trot Nixon, Jon Lester, and others meet those expectations. Others are not as fortunate.
It seems like the Red Sox had a lot of highly regarded prospects in the early 1990's who just did not pull it together. Jeff McNeely is another one of those players. McNeely was drafted in the second round of the 1989 draft and was expected to be the Red Sox center-fielder of the future, eventually taking over for Ellis Burks.
McNeely was rated the #20 prospect in Baseball America in 1991, and #16 in 1992. His minor league stats in 1991 looked great: .322/.436/.421 and 38 stolen bases. He slumped quite a bit in 1992 in AA, but bounced back in 1993 to put up better numbers in AAA Pawtucket. He even merited a call-up to the majors in September.
In 1993 with the Boston Red Sox, McNeely appeared in 21 games and went .297/.409/.378. Obviously power was not part of his game, but his batting average and on-base percentage were both decent. He also stole six bases and walked seven times. But this was the only time he would appear in the majors. He slumped again in AAA in 1994 while with Boston and then was traded after the season in the deal for Luis Alicea.
McNeely's numbers continued to drop and he ended up bouncing around a little bit, never touching the majors again.