Trading shortstop Nomar Garciaparra to the Cubs at the July 31 deadline in 2004 was a defining moment for Red Sox GM Theo Epstein, and there can be no questioning it helped Boston win its first World Series in 86 years. He dealt the team's marquee player "in one of the most momentous transactions in the modern annals of the 103-year-old franchise," wrote the Globe's Bob Hohler at the time. After making the deal, Epstein said: ''It was with mixed emotions that we let Nomar go. He's been one of the greatest Red Sox of all time.'' The Red Sox received shortstop Orlando Cabrera from the Montreal Expos and first baseman Doug Mientkiewicz from the Minnesota Twins in a multi-team deal.