WASHINGTON -AP- Starting pitcher Mat Latos hit a solo home run and Antony Rendon added a three-run shot as the Washington Nationals beat the New York Mets 8-1 on Monday.Latos had a solid first start with the Nationals, but left the game with one out in the fifth inning when he appeared to injure his right leg.The 28-year-old signed a minor league deal with Washington in June after the Chicago White Sox released him. In his first big league start since June 7, Latos allowed three hits and one run with three walks and four strikeouts as the Nationals earned their fourth straight win. Reynaldo Lopez (3-3) was among three relievers to combine for 4 2/3 scoreless innings.The Nationals increased their lead over the Mets to 10 games in the Nationals League East -- matching their largest cushion of the season -- and reduced their magic number to nine to clinch their third division title in five years.For the third straight outing Mets starter Rafael Montero (0-1) struggled with command. Montero walked three Nationals in the first inning, including Bryce Harper and Wilson Ramos with the bases loaded.Latos led off the second with a solo homer over the left field fence, beforeDaniel Murphy doubled and Harper was intentionally walked. Both scored on Rendon's 18th home run of the season to put the Nationals ahead 6-1.Montero allowed five hits and six runs in 1 2/3 innings with four walks and two strikeouts. Over his last three starts, Montero has allowed 14 walks in 11 innings.Jose Reyes hit a leadoff double in the first and later scored on a Yoenis Cespedes RBI sac fly to give New York a short-lived 1-0 lead.Ramos and Ryan Zimmerman added RBI singles for Washington.BACKMAN NOT RETURNING:Former Mets infielder Wally Backman will not return as the organization's Triple-A manager in 2017. Mets general manager Sandy Alderson told reporters that Backman "has decided to move on," after working in New York's minor league system since 2010.STREAKING:Nationals second baseman Daniel Murphy has a hit in all 17 games against the Mets this season. According to the ELIAS Sports Bureau, that ties the record for the longest hit streak against the Mets in one season (Rennie Stennett in 1974, Luis Castillo in 2002 and Dee Gordon in 2015).