He's in Michigan. Should not be St. Aug or Bermuda. I think it's a combination of crabgrass and goosegrass. They grow from seed every year. Goosegrass is a really nasty weed grass, with a prostrate growth habit, radiating out from a light colored center. Best to dig it up with a dandelion digging fork. Raising the mowing height helps to control it, or you can carefully spray the center of the clump with glyphosate mix, then pull it out more easily a couple weeks later.