GW SAAC has partnered with the Jessie Rees Foundation to help children battling cancer
Show Celebrates a Year of Excellence in GW Athletics
Colonials crank out 15 hits; Sweeney tosses complete game shutout
Colonials take game two, 9-5; series finale set for Sunday
Four Colonials to Play in Renowned Cape Cod League
2017: Appeared in 57 games with 56 starts (54 in LF, 2 at DH) ... batted .282 on the season with career-high 15 doubles, two triples and 25 RBIs ... finished 16-of-19 in steal attempts ... totaled 15 multiple-hit games and four multi-RBI games ... shared team lead with 15 doubles while ranking second on team with 40 runs, two triples and 16 stolen bases ... named to Atlantic 10 All-Championship Team after going 5-for-13 with five RBIs across three games ... three outfield assists.
Summer 2016: Played for Marthas Vineyard Sharks in the Futures Collegiate Baseball League ... appeared in six games.
2016: Appeared in 48 games with 46 starts (22 in LF, 22 at DH, 2 in RF) ... ranked third overall in the Atlantic 10 and led the team with .368 batting average ... totaled five doubles, two triples and 26 RBIs ... scored 25 runs ... finished second on team with 15 stolen bases in 21 attempts ... led team with .418 on-base percentage and finished second with 20 multiple-hit games ... totaled eight games with three or more hits ... tied for second on team with six multiple-RBI games ... zero errors in the outfield in 50 chances ... hit safely in nine consecutive games from April 30-May 19, batting .361 (13-for-36) with one double, six RBIs and five stolen bases ... went 5-for-5 with two runs, one double with one RBI against CSUN (March 5) ... batted .500 (5-for-10) with three runs in three games at Atlantic 10 Championship.
2015: Appeared in 18 games with three starts (1 in LF, 1 in RF, 1 at DH) ... scored six runs and collected three hits and three RBIs ... 3-for-3 in stolen base attempts.
High School: 5th-ranked outfielder and 33rd-ranked player in the state of Pennsylvania by Perfect Game ... First Team All-Area and Outfielder of the Year as a senior ... Perfect Game All-Region Honorable Mention as a senior ... batted .450 with four home runs, 19 RBIs, 16 runs scored and .530 on-base percentage as a senior ... All-Conference Honorable Mention as a junior after batting .370 ... Two-year varsity starter and 2014 Team Captain at Bayard Rustin High School ...Perfect Game Preseason All-American Atlantic Regional Honorable Mention and 2014 First Team Preseason All-League entering seniors season ... First Team All-League as a junior and Second Team All-League as a sophomore ... Member of Chester County's Carpenter Cup team ... Member of National Honor Society.
Personal: Born Markus Erik Osis on 9/9/95 in West Chester, PA ... son of Ellen and Ivars Osis ... has one brother, Karl ... intended major is Business Administration.
Osis' Career Batting Statistics
Ritchie Helps USA Baseball to Gold Medal
WASHINGTON - George Washington baseball head coach Gregg Ritchie and the USA Baseball Under 18 National Team concluded a historic run through the World...
Baseball Announces Walk-On Tryout
WASHINGTON - George Washington baseball head coach Gregg Ritchie has announced an informational meeting and on-field tryout session for interested students...
Baseball Adds Two to Coaching Staff
WASHINGTON - George Washington baseball head coach Gregg Ritchie has announced that Bobby Campbell '17 and Troy Marrow have joined the Colonials' coaching...
Baseball's Osis & XC/Track's DiBiasio to Lead SAAC in 2017-18
Last spring, George Washington baseball senior Mark Osis was elected to serve as the 2017-18 President of GW's Student-Athlete Advisory Council (SAAC). He...
Ritchie Continues Involvement with USA Baseball Throughout Summer
George Washington baseball head coach Gregg Ritchie has been busy in his various roles with USA Baseball throughout the summer.
20th Annual Baseball Golf Outing Set for October 20
WASHINGTON - The 20th Annual George Washington Baseball Golf Outing will be held on Friday, October 20, at the Country Club at Woodmore.
Baseball Summer League Check In
Collegiate leagues are heading down the home stretch and it is time to check in on various George Washington baseball players that are competing around the...
Raise High 'Cast: Gregg Ritchie and Jennifer Rizzotti
Ritchie and Rizzotti discuss their extensive experience working with US National Teams