In 1997, the Boston Red Sox traded Carl Pavano and Tony Armas Jr. to the Montreal Expos for Pedro Martinez.
The franchise-altering deal was a lopsided win for Boston. In seven seasons, Martinez delivered a World Series championship to the starved franchise and won two American League Cy Young Awards -- finishing second in voting two other times.
Since then, a host of big-name trades and acquisitions have followed and none have prospered in Boston like Martinez did. Some take as long as a full season to adjust to the spotlight.