It looks like Poa Trivialis ( roughstalk bluegrass) . Its used to winter-seed bermudagrass putting greens in the south, or in shady areas in the north. There is no selective control. You pretty much have to kill the patches with 'Round up' , and re-seed or use sod for a quicker fix. In the future use a weed preventer ( pre emergent herbicide) in the spring.

Thanks. Do you think it could have been brought into my yard from my landscaper's machines?

Thanks Tom! PS: Landscaper said he did use a pre emergent herbicide...

Most definitely ! All kinds of crap is transported by mowers- which are not washed off between jobs.

Thanks for the help! Maybe I'll just let it take over completely : )