Fields has seen his velocity dip to the 91-92 mph range after averaging 94.7 mph last season, the Los Angeles Times' Andy McCullough reports.

EDGE Analysis

Manager Dave Roberts believes the lack of velocity could be the reason the veteran reliever has surrendered nine earned runs in four Cactus League innings. There is no report of an injury or a case of Fields experiencing a dead arm. It is still early in the spring campaign, so there is time for the 31-year-old to figure out his power issues. If he doesn't, Fields' roster spot could be in jeopardy, considering he relies on his fastball (64 percent) as his primary weapon on the mound.