The two players were fined after they pushed and shoved each other after their match.
Holders Serbia avoided any more scares to complete a 4-1 victory over India in the Davis Cup on Sunday and Germany joined them in the quarter-finals as Philipp Petzschner edged them to victory in a thriller in Croatia. The United States also booked a home quarter-final against favourites Spain as Andy Roddick gave them a 3-1 lead in Chile with victory over Paul Capdeville.
Serena Williams and Andy Murray had brief hiccups on the way to convincing victories at the US Open, each choosing different tactics to remain on track for a long ride into the year's final Grand Slam.
The 28-year-old Blake is one of six Americans to make the last eight at the Delray Beach International.
