MANCHESTER, England (AP) — Ugo Humbert beat Stan Wawrinka 6-4, 6-4 to help France get off to a winning start against Switzerland in the group stage of the Davis Cup Finals on Tuesday.

Humbert's victory gave France an unassailable lead after Adrian Mannarino defeated Dominic Stricker 3-6, 6-1, 6-4 in Group B play.

The doubles pairing of Nicolas Mahut and Edouard Roger-Vasselin sealed the 3-0 French victory by beating Marc-Andrea Huesler and Wawrinka 6-2, 6-2.

Australia and Britain square off in Group B on Wednesday in Manchester.

Laslo Djere and Dusan Lajovic won singles matches in Serbia's 3-0 victory over South Korea in Group C at Valencia — with Spain and the Czech Republic next playing in the Spanish city.

In Group A, Chile defeated Sweden 3-0 behind singles victories by Cristian Garin and Nicolas Jarry. Defending champion Canada and Italy are also in the group.

The Netherlands won 2-1 over Finland in Group D, where Croatia will face the United States.

The top two countries in each group advance to the Final 8 in November at Malaga.