The year he turned 23, he joined the SK Wyverns as a first-round pick in the second phase of the draft.
In 2006 he won bronze with the national team at the Doha Asian Games and, in his second year as a pro, won the Golden Glove at second base. He was second in the league that year with 45 stolen bases. In 2007 SK won its first Korean Series title in its eighth year as a club, and Jeong hit a go-ahead two-run home run in Game 6. He married afterward.
The breakthrough yearThe year he turned 26, he won Olympic baseball gold in Beijing.
In 2009 he was runner-up at the World Baseball Classic and won his second Golden Glove while at boot camp. In 2010 he won gold at the Guangzhou Asian Games. In 2011 he was named MVP of the semi-playoff series.
In 2013 he signed with Hanwha as a free agent for four years and 7 billion won, and won a third Golden Glove for his season with SK. In 2015 he won the Premier12. In 2016 he was Hanwha’s captain. In 2017 he reached 350 career stolen bases.
In 2018 he re-signed with Hanwha for 2+1 years and 3.5 billion won. In 2019 he moved to LG in the second draft. In 2020 he announced his retirement after 1,747 career games.
In 2021 he appeared on the YouTube channel Maenijyeo. In 2022 he appeared on Strongest Baseball and played second base. In 2024 he opened the YouTube channel Jeong Keun-woo’s Baseball Life.
In 2025 he appeared on Bulkkot Yagu. In 2026 he became a TVING commentator and appeared on You Quiz on the Block.
Jeong Keun-woo (born Oct 2, 1982) debuted with the SK Wyverns in 2005, the year he turned 23, and won his first Golden Glove in 2006, the year he turned 24. He became known on Aug 23, 2008, the year he turned 26, when South Korea won Olympic baseball gold in Beijing.
Ages are by calendar year (the year minus the birth year), birthdays aside.