CHICAGO — He was batting a paltry .265 less than a month ago.

Now, Jung Hoo Lee is keeping company with the likes of Willie Mays and Buster Posey.

There hasn’t been a Giant since Posey — widely regarded as one of the best hitters Giants history alongside Mays and Barry Bonds — to record more hits over a 14-game stretch than Lee’s 27 during his hitting streak. You have to go all the way back to Mays in 1958 to find the last Giant with as many knocks as the 23 belonging to Lee in 10 games since returning from the injured list.

The secret behind all those successful swings? Not swinging at all.

“When I was on the IL, I didn’t just try to take time off the field,” Lee said through team interpreter Justin Han. “What I did was I went to the cage and just stood there.”

Lee missed only the minimum 10 days with a mild back strain, but he made the most of his time. Unable to swing, he stood in against the Trajekt pitching machine, which can replicate the characteristics of any offering from any pitcher in the major leagues.

Han, his interpreter, fed the machine.

“I didn’t take any swings, but just tried to feel out the pitches on the Trajekt, which helped out a lot,” Lee said. “I stood in there and [Han] just kind of randomly threw out pitches located everywhere. We would just communicate on whether it was a strike or a ball.”

Since returning from the IL, Lee is batting a remarkable 23-for-41 (.561) heading into Monday’s three-game series against Washington.

His batting average is up to .323, tied with Luis Arraez among the top five qualified hitters in the majors, after he went 1-for-4 in Sunday’s extra-innings 2-1 victory to the Cubs.

In the words of manager Tony Vitello, it’s the product of “Jung Hoo being Jung Hoo.”

“I know Ichiro is a hero of his,” Vitello said. “That style of hitting that I think we’re kind of familiar with from a lot of Asian players has got a little bit of rhythm, a little bit of movement going forward. But Ichiro was always going forward and in line with the pitcher. … I just think he’s a really good hitter. I boil it down to the mentality, but I do see him staying in line a lot better.”

Before coming to MLB, Lee led Korea’s highest level in batting three times — a career .340 hitter over seven seasons. His first two seasons in San Francisco, however, produced merely a .265 mark at the plate.

He’s not allowing himself to look too far ahead about a possible MLB batting title.

“I don’t really want to be happy about it right now. I just want to be consistent on where I’m hitting right now and see where I’m at at the end of the season.”