Justin Sumner 

Assistant Coach

Assistant Coach

​​Head Coach  General Mgr.

     Head Coach Ryan Mansfield is returning for his tenth summer with the Nevada Griffons and his ninth as Head Coach, as the longest tenured head coach in Griffons History. He also serves as the team's General Manager.  He  has the most wins under his belt as head coach for the Nevada Griffons at 226-165.  Mansfield has had the good fortune during his time with the Griffons to work with over 15 players that have gone on to play professionally. During his tenure, the Griffons have qualified for the NBC World Series National Tournament each year, with top ten finishes in 2013, 2012, and 2011. 

     The 2016 Griffons were successful again,  finishing the year with a 24-20 record.

     Coach Mansfield comes to the Griffons from Longview Community College in Lee’s Summit, Missouri, where he worked with hitters, infielders and outfielders, and coordinated base running.  Mansfield will work with  Griffons players on all aspects of the game,  but will primarily focus his efforts on working with the hitters, catchers and outfielders. Prior to his arrival in Lee’s Summit, Mansfield spent two years at  Central Methodist University where he served as catching, defensive and advance scouting coordinator as well as hitting coach.  During Mansfield’s first year at  Central Methodist University, Eagle hitters enjoyed improvement in all offensive categories.  The most notable jumps came in doubles, slugging percentage, on base percentage, a 30-point increase in average, and scoring 50 more runs than the previous year while finishing one game shy of a bid to the Opening Round of the NAIA National Tournament.  In 2013, Mansfield helped guide the Central Methodist Eagles to their first HAAC Conference Championship since 1975 as well as Central’s first appearance in school history at the Opening Round of the NAIA National Tournament. 

     Before working at Central Methodist University, Mansfield served as an assistant at Fort Scott Community College in Fort Scott, Kansas from 2005-2011. While at Fort Scott, Mansfield served in many capacities,  including hitting coach, recruiting coordinator, catching coordinator, outfield coach and field maintenance supervisor. Most notably Mansfield helped the Fort Scott squad reach a 40+ win season in 2011 which was the first in over a decade  and the second highest win total in the program’s history. The Greyhounds also saw an increase in stolen bases, batting average, runs, hits, doubles and slugging percentage for the 2011 campaign. Mansfield  worked with 18 Academic All Americans, 10 Distinguished Academic All Americans, 10 All Region Players, 37 All Conference Players and more than 45 players moving on to the Division I and Division II levels during his time at Fort Scott.

     In addition to his duties at with the Griffons and Longview Community College, Mansfield has been an associate scout with the Boston Red Sox for the last seven years and is now currently working for the Baltimore Orioles. Mansfield has had the privilege of working with over 20 players who have gone on to play professional baseball.


Ryan Mansfield

Griffons 2017 Coaching Staff

Justin Sumner rejoins the Griffons for the 2017 season after spending the 2011 and 2012 seasons on the staff.  He has coached at both the collegiate and high school levels.  He has had stops at University of Saint Mary, Lawson State CC and Saint Anselm College.  He has also been an assistant and head coach at Rich Hill High School.  He has worked primarily with position players and hitters. 




Wally Marciel 

​​​​      Wally Marciel (mar-SEE - ell) joins the Nevada Griffon staff as Pitching Coach for the 2017 season.  Marciel is a native of Kailua, Hawaii, but he is already very well acquainted with the MINK League, as he spent the past three years as an assistant for the Chillicothe Mudcats, handling all the pitching instruction and coaching first base.  

   Marciel is in his third season at the University of Kansas, working under head coach Ritch Price and serving as the Jayhawks' Director of Baseball Operations.  He coordinates all baseball operations and provides logistical support at all games.  In addition to those duties, he is also in charge of all Jayhawk Baseball Camps, serving children ages 5 to 18.

    A left-handed pitcher, Marciel played for Price at KU from 2007-11, appearing in 79 games, with 25 starts.  He finished his career with a record of 25-11, including a win over 19th ranked opponent Baylor in April, 2011.