Lithuania pulled away early in the third quarter to beat Russia 77-64 in the opening Group F clash for the two sides.
Russia led 33-32 at half-time but after the break failed to contain Lithuania's Grete Sniokaite.
She had 16 of her game-high 24 points in the the third frame.
"I just felt that my team needed me to step up," said Sniokaite, who had just three points in the opening half.
With Russia leading 37-34 early in the third stanza, Lithuania hit their opponents with a 25-9 run over the next 10 minutes to take a 59-46 advantage.
Russia stepped up their defense and forced Lithuania to commit 12 of their 21 turnovers in the final quarter but the Baltic nation held on for their fourth win of the tournament.
"We were nervous in the final quarter," said Sniokaite. "We made mistakes and allowed them to score easy baskets.
"But we held on for another win and that is the most important thing."
Russia, who had outrebounded Lithuania 20-15 at the break, lost the battle of the boards 37-33.
Lithuania were 29 of 36 (80.6%) from the charity stripe while the Russians finished 13 of 21 (61.9%).