At the time of writing (3-Aug-2011) this is easily boostable during North American daytime (don't know about other times but we did it during this time) with another partner.
Both start a head-to-head ranked match, and deselect the first four maps to ease trying to find each other. Then start to find each other. Once you find each other have one person concede/surrender the match. Then as soon as the match ends both start the search again and based on timing you're almost always able to find each other again. Trade wins this way and you should be able to pull at least 20-30 wins an hour each.
You can also get the other achievements based on ranked wins using this method:
just to name a few.