He was the Swallow's 2nd pick in the 2012 draft, next to Taichi Ishiyama (industrial league).
On November 28, he signed a contract with the Swallows for an annual salary of 12 million yen, with an additional signing bonus of 70 million.
He was assigned the jersey number 29.

2013
He pitched 6.2 scoreless innings in his first official match on April 3, and secured his first victory when the Swallows beat the Carps by 4 runs, the first among his fellow rookie pitchers to do so.
It was also his mother's birthday on that day.
His second win came a week later, when he pitched 7 innings against the Chunichi Dragons without surrendering any runs, and gave up only a single hit to Hector Luna.

By mid-season, he pitched his first shutout win, and became the first rookie in franchise history to record his seventh victory before the end of June.
He again tossed another shutout a few days later.
His pitching prowess showed no signs of stopping when he became the 2nd Swallows pitcher, and the 8th rookie pitcher in NPB history to record a win during the All-Star Series.
He then went on a 7-game winning streak (the first Swallows rookie to do so), and his win tally already reached 12 by early August.

Even though the Swallows finished in the rear, Ogawa gave the fans a reason to celebrate in what has otherwise been a very disappointing season.
He led the Central League in wins, going 16-4 with a 2.93 ERA in 26 appearances, and received the 2013 Rookie of the Year award.

By December, he still kept on breaking the record books when the Swallows gave him a 44 million yen raise, to make 56 million yen on 2014.
This was the highest salary for a Yakult player after their first year, beating Ryo Kawashima's 42 million in 2004.

2014
He started the year by giving the Swallows their first victory on the March 28 opening day match against the Baystars.
On April 11, despite being charged with a balk while trying to do a pickoff to third, he held the Baystars at bay and notched his 3rd straight win.
With this, he became the first Swallows pitcher in 44 years to win 3 consecutive starts since starting the opening day(since Hiromu Matsuoka in 1970).

Unfortunately, his winning streak came to a halt when a batted ball struck his right hand during a game against Hanshin on the April 18, where he also gave up 4 runs.
He was diagnosed with a fracture in his right hamate hook bone and was taken off the active roster 2 days later.
He underwent rehabilitation for 2 months and returned on July 12, but he surrendered 5 runs to the Baystars and once again earned the loss.
He managed to get his game back on his next outing however, when held the Carps scoreless for 7 innings.
He was the Swallow's 2nd pick in the 2012 draft, next to Taichi Ishiyama (industrial league). On November 28, he signed a contract with the Swallows for an annual salary of 12 million yen, with an additional signing bonus of 70 million. He was assigned the jersey number 29.
2013
He pitched 6.2 scoreless innings in his first official match on April 3, and secured his first victory when the Swallows beat the Carps by 4 runs, the first among his fellow rookie pitchers to do so. It was also his mother's birthday on that day. His second win came a week later, when he pitched 7 innings against the Chunichi Dragons without surrendering any runs, and gave up only a single hit to Hector Luna.
By mid-season, he pitched his first shutout win, and became the first rookie in franchise history to record his seventh victory before the end of June. He again tossed another shutout a few days later. His pitching prowess showed no signs of stopping when he became the 2nd Swallows pitcher, and the 8th rookie pitcher in NPB history to record a win during the All-Star Series. He then went on a 7-game winning streak (the first Swallows rookie to do so), and his win tally already reached 12 by early August.
Even though the Swallows finished in the rear, Ogawa gave the fans a reason to celebrate in what has otherwise been a very disappointing season. He led the Central League in wins, going 16-4 with a 2.93 ERA in 26 appearances, and received the 2013 Rookie of the Year award.
By December, he still kept on breaking the record books when the Swallows gave him a 44 million yen raise, to make 56 million yen on 2014. This was the highest salary for a Yakult player after their first year, beating Ryo Kawashima's 42 million in 2004.
2014
He started the year by giving the Swallows their first victory on the March 28 opening day match against the Baystars. On April 11, despite being charged with a balk while trying to do a pickoff to third, he held the Baystars at bay and notched his 3rd straight win. With this, he became the first Swallows pitcher in 44 years to win 3 consecutive starts since starting the opening day(since Hiromu Matsuoka in 1970).
Unfortunately, his winning streak came to a halt when a batted ball struck his right hand during a game against Hanshin on the April 18, where he also gave up 4 runs. He was diagnosed with a fracture in his right hamate hook bone and was taken off the active roster 2 days later. He underwent rehabilitation for 2 months and returned on July 12, but he surrendered 5 runs to the Baystars and once again earned the loss. He managed to get his game back on his next outing however, when held the Carps scoreless for 7 innings.
Yasuhiro Ogawa