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2013: Threw 11.2 innings in six appearances, making one start … Missed early part of the season due to injury … Made first relief appearance against Cornell, throwing two hitless innings and striking out one (4/14/13) … Held Princeton scoreless over two innings of relief (4/21/13) … Recorded two strikeouts in 1.2 innings of work at Penn (4/27/13) … Struck out a season-high six batters in 3.2 innings of relief against Dartmouth in the second game of the Ivy League Championship Series (5/4/13) … Started Columbia’s NCAA tournament game against Arizona State, striking out two batters (6/2/13).

2012: All-Ivy League honorable mention as a starting pitcher ... made nine starts on the mound as part of Columbia's weekend rotation ... gained victories in his last three starts ... held opponents to a .254 batting average ... went 3-2 with a 2.86 ERA in five Ivy League starts ... named Ivy League Pitcher of the Week after complete-game victory in Lions' 6-2 win at San Diego ... allowed just two runs on three hits against the high-powered Torero offense ... did not walk anyone, struck out three and allowed two runs in six innings at Santa Clara ... struck out five without allowing a walk in five innings vs. Brown ... worked six innings and struck out seven to notch the victory in a 5-1 win at Cornell ... allowed three earned runs in 5 2/3 innings in an 8-5 win vs. Princeton ... ended the year with a flourish, a brilliant seven-inning outing vs. Penn ... allowed just three hits and two walks and matched his career high with nine strikeouts in Columbia's season-ending 11-1 win.

2011: Honorable mention All-Ivy League starting pitcher ... made nine appearances ... started seven times ... team's Cy Young award winner ... earned first collegiate save with two hitless innings of relief to finish Lions' 3-1 win over Central Michigan ... struck out five and allowed one run in four innings at South Alabama ... allowed one run on three hits in three innings of relief at Central Florida ... combined with Harrison Slutsky on a shutout of Harvard after he tossed seven shutout innings, allowing just three singles ... struck out five and allowed one earned run in eight innings at Brown ... tossed a complete-game shutout vs. Cornell, allowing three hits and two walks in seven innings.

2010: Started 10 times on the hill ... one of Columbia's four weekend starters ... struck out 40 batters in 49 1/3 innings ... had strong college debut at UNLV, yielding four runs in six innings with six strikeouts ... struck out nine batters in seven innings in eventual 5-3 victory vs. Bucknell ... earned first collegiate victory with six strong innings vs. Princeton, allowing two runs and striking out six ... notched the win in regular season finale vs. Penn with seven-inning effort, allowing three runs.

At Santa Margarita Catholic: Two-time letterwinner ... pitched to a 3.55 ERA as a senior ... played summer ball with the ASD Bulldogs, Milwaukee Brewers elite team and the Kansas City Royals scout team.

Personal: Political Science major ... lifetime member of California Scholarship Federation ... son of Kristin and Mark Olson ... Stefan Paul Olson, b. June 23, 1991 in Mission Viejo, Calif.

Year ERA W-L App. GS CG SHO/CBO SV IP H R ER BB SO
2010 5.47 2-2 10 10 0 0/0 0 49.1 63 39 30 20 40
2011 3.63 2-2 9 7 1 1/1 1 44.2 34 20 18 22 34
2012 3.65 4-5 9 9 1 0/0 0 49.1 49 23 20 12 38
2013 6.17 1-2 6 1 0 0/0 3 11.2 7 8 8 8 13
Total 4.41 9-11 34 27 2 1/1 4 155.0 153 90 76 62 125

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