Adam LaRoche added to his home run tear with a two-run shot and the Washington Nationals beat the Chicago Cubs 9-2 in a fight-filled game on Thursday night to finish a lopsided four-game sweep.

The trouble started with a testy exchange between Cubs bench coach Jamie Quirk and Nationals third base coach Bo Porter in the fifth inning. Quirk shouted from the dugout toward third base and Porter walked over to the railing, jawing and pointing his finger. The benches and bullpens emptied, but there was no pushing or shoving. Quirk was ejected before play resumed.

In the sixth, Chicago reliever Lendy Castillo threw his first pitch of the inning near Bryce Harper's legs and the ball that sailed all the way to the backstop. Harper made a move toward the mound and was quickly intercepted by catcher Steve Clevenger.