Mark Vientos
19-Year-Old Third Baseman3B
2019 Fantasy Outlook
Vientos was drafted with the No. 59 pick in 2017, has not had any significant injuries, yet will not be making his full-season debut until 2019. Such is the typical path for the youngest prep hitter in a draft class. He did not turn 19 until this offseason, so it's not like he will be old for the Sally League, he just needed two years worth of short-season reps to prepare for the challenge. Vientos flashed his power upside in 2017, hitting four homers in the Gulf Coast League as a 17-year-old, but his performance in 2018 was even more impressive. He was the Appy League's third youngest hitter, yet ranked in the top 10 in wRC+ (132), ISO (.202) and BB/K (0.86). At 6-foot-4, 185 pounds, he has an ideal frame for his age and position. It is not a stretch to say he is tracking toward 30-plus homer power, and while he is unlikely to ever hit .300, his 14.1 BB% portends a high enough OBP to justify placement in the middle of a big-league lineup. Read Past Outlooks
RANKSFrom Preseason
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$Signed a contract with the Mets in June of 2017 that includes a $1.5 million signing bonus.
Poor start to season
3BNew York Mets  A
April 29, 2019
Vientos is slashing .225/.313/.310 through 21 games for Low-A Columbia with one home run and seven RBI.
ANALYSIS
The 19-year-old has looked a little overmatched in his first taste of full-season ball, posting a 7:22 BB:K after he managed a much more impressive 37:43 mark through 60 games in the Appy League last year. Vientos should eventually figure things out, and given his age just holding his own at this level would be a solid achievement, but the Mets' No. 4 fantasy prospect is capable of much more than treading water once things begin to click.
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2018 Fantasy Outlook
Betting on the youngest of the prep hitters in a draft class will often bear fruit, and Vientos is the prime example from 2017. When he turned 18 in December he already had 51 pro games under his belt and a $1.5 million signing bonus in his bank account. At 6-foot-4, 185 pounds, and as a below-average runner, it would be pretty optimistic to expect him to stick at shortstop long term, but he should fill out nicely and resemble a prototypical power-hitting third baseman. The most encouraging aspect of his first crack at pro pitching was the four home runs he hit as the sixth youngest position player in the Gulf Coast League. Typically prospects like Vientos take a year or two to start showing off their power potential, but he wasted no time confirming the Mets’ evaluation of his long-term power upside. A hot August in the GCL (.307/.340/.477) earned him a brief taste of the Appalachian League, and he could be aggressively assigned to Low-A this spring.
More Fantasy News
Beginning year at Low-A
3BNew York Mets  A
April 4, 2019
Vientos will begin the season with Low-A Columbia, Mike Rosenbaum of MLB.com reports.
ANALYSIS
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Enjoying power surge in Rookie ball
3BNew York Mets  A
July 28, 2018
Vientos went 3-for-5 with two home runs and seven RBI for Rookie-league Kingsport in Friday's win over Burlington.
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Delayed start to 2018 season
3BNew York Mets  A
April 5, 2018
Vientos will remain behind in extended spring training to begin the season, Jonathan Mayo of MLB.com reports.
ANALYSIS
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Heating up in GCL
3BNew York Mets  A
August 18, 2017
Vientos went 4-for-5 with a solo home run and a second run scored for the GCL Mets in Thursday's win over the Cardinals' affiliate.
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Popped by Mets with 59th overall pick
3BNew York Mets  A
June 12, 2017
The Mets have selected Vientos with the 59th overall pick in the 2017 first-year player draft.
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