How big are those leaves? Consider lawn pennywort, Hydrocotyle sibthorpioides. I see some little round seed clusters in the lower left corner of the picture.

They both look quite similar. Any "weed" killer containing 2,4,D and Dicambra should control the unwanted broad leafed plant, but taking a good, in depth look at the soil and making necessary corrections may limit future growth.

The people at your local office of the Cornell Cooperative Extension Service will be able to give you a more positive identification.

kimmq is kimmsr

It isn't Glechoma hederacea. I think atlamol has it.

Yes, I think so too.

The leaves are small a little under a half inch