Ohlendorf completed his degree at Princeton in 2006 while in the Arizona Diamondbacks' farm system.[8] He received the George Mueller Award from the university for combining "high scholarly achievement in the study of engineering with quality performance in intercollegiate athletics". In his senior thesis, Ohlendorf used sabermetrics to demonstrate the return on investment from the Major League Baseball Draft.[8][9]
In 2006, playing for the Diamondbacks AA affiliate, the Tennessee Smokies, Ohlendorf went 10–8 with a 3.29 ERA and led the Southern League with four complete games, earning a promotion to AAATucson for one playoff start.
Ohlendorf pitched mostly for the AAA Scranton/Wilkes-Barre Yankees in 2007. Ohlendorf struggled with injuries and inconsistency as a starter with Scranton and was moved to the bullpen. Ohlendorf embraced his new role and pitched extremely effectively, able to maintain a higher velocity and precision on his pitches due to shorter outings.[15] On September 9, when Scranton was eliminated from the playoffs, Ohlendorf was promoted to the Major Leagues.[16]
On September 11, he pitched in his first Major League game against the Toronto Blue Jays for the Yankees. He pitched one inning without allowing a baserunner while striking out one.[17] On September 15, he pitched 11⁄3 innings against the Boston Red Sox, allowing a walk and a home run, but recording all four outs on strikeouts.[18] Ohlendorf impressed the Yankees enough in September to earn a spot on the ALDS roster, but struggled in his lone appearance in the series, allowing three runs on four hits and one walk in one inning.[19]
Ohlendorf spent the first month pitching for the AAA Indianapolis Indians and was called up to Pittsburgh on September 2 when the rosters expanded.[21] He was added to the starting rotation and made his first appearance on September 3 against the Cincinnati Reds where he pitched six innings and allowed four runs (three earned) in a 6–5 Pirates victory.[22] When Ohlendorf faced Will Venable who batted leadoff on September 28, 2008, for San Diego, he became the first Princeton pitcher to oppose a Princeton batter.[23][24][25]
Ohlendorf was a stamina pitcher, often lasting late into games. In all, he threw 1762⁄3 innings, 45 more than his previous year total. The Pirates would shut him down for the remainder of the season following his September 19 start to rest him for next year. Pirates General Manager Neal Huntington would say, "We're looking forward to working with him to put him in position to where he can be a 200-plus inning starter for many, many years to come."[26]
On September 5, 2009, Ohlendorf became the 40th major-league pitcher to throw an immaculate inning, striking out all three St. Louis Cardinals batters in the seventh inning on nine total pitches.[27][28] Ohlendorf would pitch his first full season in the majors for the Pirates in 2009. His final 2009 stats were an 11–10 record, a 3.92 ERA, 25 home runs allowed, seven hit batsmen, 53 walks, 109 strikeouts, a .255 average against, and a 1.23 walks and hits per inning pitched in 176.2 innings. He would earn the status of being the only Pirates starter to have a winning record.
Ohlendorf was hit in the head by a line drive off of Troy Tulowitzki's bat in a July 28, 2010, game against the Colorado Rockies. He left the game as a precaution. This was the second time in 2010 a Pirates pitcher was hit in the head by a line drive, the first being Chris Jakubauskas.[29] Unlike Jakubauskas, Ohlendorf did not miss any starts. Following the season and a 1–11 record with a 4.07 ERA, Ohlendorf won his arbitration hearing and a $439,000 raise to $2,025,000.[30]
Ohlendorf only made two starts in 2011 before going on the disabled list with a shoulder strain, and after experiencing a setback in his rehab program did not make another major league start until August 23.[31] On September 15, Ohlendorf hit his first career home run off Dana Eveland, also becoming the first Pirates pitcher to homer since Paul Maholm did so on May 9, 2009, against the New York Mets.[32] Ohlendorf finished 2011 with a 1–3 record in nine games with an 8.15 ERA. On December 7, 2011, Ohlendorf was released by the Pirates.[33]
Boston Red Sox
On February 16, 2012, Ohlendorf signed a minor league contract with the Boston Red Sox.[34] He was assigned to the Triple-A Pawtucket Red Sox where he compiled a 4–3 record and 4.61 ERA in 10 starts. Ohlendorf opted out of his contract of June 1, 2012, and became a free agent.[35]
San Diego Padres
On June 4, 2012, Ohlendorf signed a one-year deal with the San Diego Padres.[36] He was initially used out of the bullpen, but numerous injuries to the Padres' rotation gave him an opportunity to start. He made his first major league start of the season on June 16.[37]
Ohlendorf made nine starts in 13 total appearances for the Padres and posted a 4–4 record and a 7.58 ERA in 482⁄3 innings. He was optioned to Triple-A Tucson on August 18 after lasting only 13 total innings in his last four starts with a 14.54 ERA.[38] The Padres designated Ohlendorf for assignment on September 4,[39] and he became a free agent after the season.
Washington Nationals
On January 10, 2013, Ohlendorf signed a minor league contract with the Washington Nationals.[40] On July 26, 2013, he started against the New York Mets in the second game of a day/night double header. Ohlendorf enjoyed a successful 2013 season, recording 4 wins and a 3.28 ERA in 16 appearances. After the season, Ohlendorf signed a one-year deal to return to Washington, avoiding arbitration.[41]
On March 26, 2014, the Nationals voided Ohlendorf's deal by sending him down to AAA.[42] Ohlendorf did not pitch in the Majors due to numerous injuries, including a back injury which limited him to appearing in just five minor league games. After the season, he became a free agent.
Texas Rangers
On January 23, 2015, Ohlendorf signed a minor league contract with the Texas Rangers.[43] He was called up to the majors on May 17. Ohlendorf pitched seven and two thirds innings for the Rangers, striking out nine while allowing three runs in eight appearances out of the bullpen. On June 7, he was placed on the disabled list with a strained right groin.[44] On July 27, he was designated for assignment by the Rangers.[45] He was released on July 31. He was re-signed by the Rangers on August 5,[46] and added to the major league roster on September 1.[47] In the 14th inning of Game 2 of the 2015 American League Division Series, Ohlendorf would pick up a save in the Rangers 6-4 win over the Toronto Blue Jays.[48] He became a free agent following the season.
Kansas City Royals
On February 18, 2016, the Kansas City Royals signed Ohlendorf to a minor league contract.[49] He opted out of his minor league contract on March 21 and became a free agent on March 23, after the Royals declined to add him to the 40-man roster.[50]
Cincinnati Reds
On March 26, 2016, Ohlendorf signed a one-year, major league contract with the Cincinnati Reds.[51] He became a free agent following the season.
Ohlendorf relies on a sinking fastball thrown at 89-92 MPH, along with a low 80's slider and a changeup. Beginning in 2013, he switched to an "old school" windup where the hands are separated (the ball remains in his glove, set where he can quickly grip the ball) before coming back together.[55]
Personal life
Ohlendorf's brother Chad also attended Princeton and pitched for the school.[56]
In 2010, Ohlendorf was chosen as the third-smartest athlete in sports by the Sporting News, behind baseball pitcher Craig Breslow and football player Myron Rolle.[59]