[3] The team represented Manitoba at the 1999 Canadian Junior Curling Championships, where they finished with a 6-6 record.

In 2009, his rink of Allison Nimik (Flaxey), Ross Derksen and Kendra Green would represent Manitoba at the 2009 Canadian Mixed Curling Championship.

Grassie and Nimik then went on to represent Canada at the 2009 World Mixed Doubles Curling Championship.

The pair won their pool, winning all eight games, however lost in the semi-final to Hungary.

In addition to being an accomplished curler, Grassie also wrote a book about the history of the MCA Bonspiel, called "Kings of the Rings".