Logan Jared Ondrusek (born February 13, 1985) is an American professional baseball pitcher who is a free agent.

[2] In 2010, Ondrusek made the Reds' Opening Day roster with a strong showing in spring training, throwing 10 scoreless innings.

[3] He made his first professional appearance on Opening Day at Great American Ballpark, pitching a scoreless eighth inning against the St. Louis Cardinals.

[4] Despite a rough initial appearance upon his return to the big leagues (giving up a home run to Matt Holliday in his first game back), Ondrusek settled down, with a 1.27 ERA from his June 1 recall through August 10.

[5] Ondrusek earned the first win of his MLB career on July 23 against the Houston Astros after pitching a scoreless seventh inning.

In Game 2, Ondrusek was brought in with two outs and the bases loaded in the sixth inning, and allowed a run on a hit batsman.

Ondrusek played most of 2012 with Cincinnati, but was optioned to Louisville on August 21 when the Reds were in need of a catcher after Devin Mesoraco was suspended.

[10] Ondrusek began 2013 with the Double-A Pensacola Blue Wahoos after a spring training in which he gave up nine runs in 10+2⁄3 innings with a WHIP of 2.062.

[14] On December 29, 2014, Ondrusek signed a one-year deal with the Tokyo Yakult Swallows of the Nippon Professional Baseball.

Ondrusek was suspended by the Swallows for an incident with the team's coaches in a June 26 game and was later released by the club.

On July 29, 2016, Ondrusek signed a major league contract with the Baltimore Orioles, who designated relief pitcher Chaz Roe for assignment to clear roster space.

[22] In 16 appearances split between the Double-A Tulsa Drillers and Triple-A Oklahoma City Dodgers, he accumulated a 4.50 ERA with 24 strikeouts across 22 innings pitched.

On July 25, 2018, Ondrusek signed with the Long Island Ducks of the Atlantic League of Professional Baseball.

[23] In 22 appearances (15 starts) split between the Double–A Harrisburg Senators and Triple–A Fresno Grizzlies, he accumulated a 4–6 record and 6.80 ERA with 71 strikeouts across 83+1⁄3 innings pitched.

Ondrusek made 14 appearances (13 starts) for the Lions during the 2023 campaign, registering a 4-5 record and 2.35 ERA with 73 strikeouts across 84+1⁄3 innings pitched.