The Montreal Impact acquired the services of Uruguayan international midfielder Alejandro Silva on Monday from CA Lanus of Argentina.
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Josef Martinez scored his fourth career hat trick and Graham Zusi fired home a stunner.
Penalties, early red card, and late goals summed of the third week of the MLS season.
Czech Republic international Borek Dockal made his MLS debut for the Philadelphia Union in their 0-0 draw vs. Columbus on Saturday.
An early penalty was enough for Real Salt Lake to take down the Red Bulls.
Sporting Kansas City made it back-to-back league wins after a 3-2 win over San Jose on Saturday.
An early red card gave Atlanta all the advantage they needed to run over Vancouver.