Kyle Edmund secured a superb straight-set win over Janko Tipsarevic to give Great Britain a 1-0 lead in their Davis Cup quarter-final tie against Serbia.
Rain twice interrupted the match on clay in Belgrade, but it did not affect the 21-year-old Briton's concentration as he beat the former world number eight 6-3 6-4 6-0.
Tipsarevic, who returned in April after two years out, struggled throughout.
James Ward will play Dusan Lajovic in the next singles rubber.
Edmund is leading the team, with Wimbledon champion Andy Murray in Belgrade only as a supporter.
More to follow.