“Well, one time all of a sudden the light show starts going on,” Wozniacki griped to the press.
Milos Raonic prevailed over Steve Johnson in straight sets; Ivo Karlovic conquered Lukas Rosol.
The Dane won 7-6 (4), 6-7 (5), 6-2 to beat Sharapova for the second straight time.
The Spaniard prevailed 7-6 (3) 6-3 and will next play Yen-Hsun Lu.
The Spaniard, who hasn't played Basel in 10 years, is dealing with appendicitis.
The final player to reach the WTA Finals outlasted a prospective year-end No. 1.
The Russian was one of the great ball-strikers and anti-celebrities of his generation.
Who's the best of the best? Previews and predictions for this week's WTA Finals.
The ATP's year-end race picks up again in Basel and Valencia. A look ahead at both events.