Howard, from Penetanguishene, Ont., scored a single in the eighth end for the victory at the Selkirk Recreational Complex.
In other men's games, Steve Laycock of Saskatoon defeated Sweden's Niklas Edin 6-5 and Sven Michel topped Peter de Cruz 6-2 in a matchup of Swiss rinks.
In women's play, Ottawa's Rachel Homan needed an extra end in a 7-5 win over Switzerland's Alina Paetz and Russia's Anna Sidorova beat Winnipeg's Allison Flaxey 6-3.
Earlier, Chelsea Carey of Winnipeg beat Silvana Tirinzoni of Switzerland 6-3, Val Sweeting of Vegreville, Alta., topped Heather Nedohin of Sherwood Park, Alta., 7-4 and Switzerland's Binia Feltscher defeated Sherry Anderson of Delisle, Sask., 5-3.
Play continues later Wednesday. The $100,000 competition continues through Sunday.