By Michael Vega Globe Staff MINOR LEAGUE NOTEBOOK Chris Martin's path to professional baseball wasn't so smoothly paved. It was pockmarked by several obstacles - huge potholes, actually. ``It's been a long journey,'' Martin said of the unconventional route the 6-foot-7-inch reliever with 95-mile-per-hour velocity took the last three years to earn a tryout and sign a minor league contract with the Red Sox. ``It's been a humbling one.'' When he partially tore the labr
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