Washington stretched its winning streak to 10 games, tying a franchise record and setting a high for the NL this season. The team has swept three straight series and four overall; as the Montreal Expos, the team had three sweeps in all of 2004. Junior Spivey hit a two-run homer, Tony Armas Jr. waded through trouble for five scoreless innings, and the Washington Nationals completed a 12-1 homestand by beating the Seattle Mariners 3-2 Sunday. Chad Cordero worked the ninth for his 19th save in 21 chances.