Scouting Mariano Rivera Jr.

Mariano Rivera Jr.           RHP        Evaluated 3x in 2017, Most Recently 6/6/17

Fastball (45/50)   Slider (40/45)   Changeup (30/35)   Command (40/40)

Washington’s 4th round pick in 2015, signed for $410,700; 23.5 y/o who is listed at 5-11 155lbs and looks smaller, appears to be wearing his older brother’s uniform; very little to no projection left.  Rivera’s a pure relief prospect, pitching exclusively from the stretch and utilizes an almost straight over the top arm slot.  He has a fast arm and a short arm swing.  His mechanics are not particularly smooth, as his medium leg lift leads into throwing off a stiff from leg and a significant head “whack” after foot strike.  Furthermore, he struggles repeating his delivery, hindering both his command and control.

3-pitch repertoire: Fastball (90-93mph, T94) shows late life and occasional arm-side action when he stayed on top; pitch flattens with little plane when he drops his arm slot.  The fastball “plays down” due to the lack of movement and command issues.  The slider (84-87mph) is extremely inconsistent – at the lower bands he struggles with his location and the pitch becomes slurvy.  At the higher velocities it works more like a cutter, sometimes moving away from the barrel and other times finding the heart of the zone.  Rivera will throw the occasional (81-83mph) changeup, but it is a subpar offering as he visibly slows his arm down, causing it to resemble a batting practice fastball.  I applaud the effort in trying to throw a changeup, but it needs significant improvement to be a major league offering.

Rivera has looked underwhelming in each of the outings I have seen this season.  It is concerning he is acting as a non-closer in High-A two years post-draft and struggling against younger competition.  He has good fastball velocity and shows the ability to spin a breaking pitch, but his lack of an above-average pitch and mediocre command limits his ceiling.  Considering he is a 4th round pick and the son of the greatest reliever in history, he will get more opportunities than similarly talented prospects.  However, Rivera profiles as a reliever who stagnates in the upper minors, with the best case scenario being he gets a “cup of coffee” in the major leagues.

5 thoughts on “Scouting Mariano Rivera Jr.

  1. Hmmmm ! Draft over. Brass makes promotions for pitching and signs – your word- very diminutive – Stanford for senators .
    Another Royal connection
    Feels like 108F in DFW

  2. Lannon did not convert as did Rafiel Santana
    Your prediction of Jon Niese just might pan out ?
    Mick Van Vossen. Cash 💰 commodity

    • The recent signing off Royals waiver list signals the Robles woes @A plus .
      We both know Hagerstown would be above Kannapiolis with healthy Carter and Juan S

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