Career
He debuted for the national team when he was just 18 years old. Tseng was 0–1 with a 1.80 European Research Area in the 2011 Asian Junior Championship. In the 2012 World Junior Baseball Championship, he was superb at 3–0, 0.84 with a save.
In 21 1/3 innings, he fanned 22 and allowed only 12 hits and 2 walks.
He beat Canada, South of Korea and Colombia. He was second in the event in strikeouts (four behind Shintaro Fujinami), led in wins and tied Jae-minimum Shim for the most appearances (6).
He was named the tourney"s All-Star relief pitcher. Jen-Ho then was the only high schooler picked for Taiwan"s squad in the 2013 World Baseball Classic Qualifiers, 3 1/2 years younger than Yao-Lin Wang, the next-youngest).
Relieving Kai-Wen Cheng with a 7–0 lead in the 7th, he retired Moko Moanaroa then walked Beau Bishop.
Tseng recovered to fan two players with minor league experience in the United States, Alan Schoenberger and Tim Auty, to end the inning. He was replaced by Yen-Feng Lin in the 8th. He remained with Taiwan for the 2012 Asian Baseball Championship, going 1–0 and tossing six shutout innings.
He beat rival South of Korea to help ensure Taiwan getting a Silver Medal and of Korea the Bronze.
Tseng is a 6 ft 1 in, 210 lb right-handed pitcher. He throws a slider, sinker, changeup and a knuckle-curve.
His peak speed has been 95 mph as of 2012. Tseng was signed by the Chicago Cubs as a non-drafted free agent on July 25, 2013.
He currently pitches for the Myrtle Beach Pelicans of the Class A Carolina League.