Outfielder Alex Jackson, the sixth overall pick in last June’s draft, is the Mariners’ top prospect in rankings just released by Baseball America.
“Jackson has the highest ceiling among high school hitters the Mariners have drafted since they picked Alex Rodriguez No. 1 overall in 1993,” the magazine raves in its current issue.
The top five picks are position players: Third baseman D.J. Peterson is No. 2, followed by infielders Ketel Marte and Patrick Kivlehan, and outfielder Austin Wilson.
Peterson was the club’s first-round pick in 2013 and appears likely to shift to first base in the upcoming season. Marte was recently added to the 40-man roster and is a candidate to make next year’s club as a utilityman.
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The rest of the top 10: right-handed pitcher Edwin Diaz, outfielder Gabby Guerrero, left-handed pitcher Luiz Gohara, left-handed pitcher Ryan Yarbrough and right-handed reliever Carson Smith.
Smith made his major-league debut last September by working 8 1/3 scoreless innings in nine appearances.