KEY BISCAYNE, Fla. — Maria Sharapova was confused and Caroline Wozniacki was mad. The linesman was wrong and the chair umpire was right.

KEY BISCAYNE, Fla. — Maria Sharapova was confused and Caroline Wozniacki was mad. The linesman was wrong and the chair umpire was right.

Sharapova won the disputed final point after an overrule by the umpire, edging Wozniacki 4-6, 6-2, 6-4 Thursday in the semifinals at the Sony Ericsson Open.

"Obviously you don't want it to end that way," said Sharapova, who will meet Agnieszka Radwanska in Saturday's final.

At 40-30 in the last game, Sharapova hit a second serve that the linesman called long, which would have been a double-fault, but umpire Kader Nouni immediately reversed the ruling and ordered the point replayed. The call couldn't be reviewed because Wozniacki had no challenges left, although TV replays showed Nouni was correct to overrule.

Sharapova was awarded two serves and took advantage with a big first serve to set up an overhead slam for the victory.

Wozniacki, angry about the overrule, declined to shake Nouni's hand and had words with him as she walked to the exit.

Top-ranked Novak Djokovic advanced to the men's semifinals without argument, beating No. 5 David Ferrer 6-2, 7-6 (1). Djokovic lost a remarkable 40-shot rally that had spectators gasping as it progressed, but he played a nearly flawless tiebreaker to seal the victory.

Djokovic seeks his third Key Biscayne title and second in a row. His opponent tonight will be No. 21 Juan Monaco, who advanced on his 28th birthday by eliminating the last American in either singles draw, No. 8 Mardy Fish. The scrappy Monaco dominated from the baseline and hit only eight second serves during the 6-1, 6-3 victory.

No. 2 Rafael Nadal, seeking his first Key Biscayne title, plays 2009 champion Andy Murray in the other semifinal.