The 20-year-old Dane needed little more than 50 minutes to overcome Elena Dementieva, the former Olympic champion from Russia, by 6-1, 6-1, demonstrating some of the consistency and versatility which has brought such a remarkable sequence in recent weeks.
Wozniacki has now won 31 of her last 33 matches, her rhythm, timing, and superb movement again being conspicuous as she outplayed the tournament's most experienced player.
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"Of course, now I'm the player to beat. You know, it's just a nice feeling. It's nice to know that I've done so good results that I'm the number one player in the world. That is a fantastic feeling," Wozniacki said.
That confidence was in evidence right from the start, when she broke serve immediately, raced to a 3-0 lead, and demonstrated to Dementieva that most of the rallies could only only be won after much graft.
Soon Dementieva was trying to break up Wozniacki's pattern of containment and mobility with sudden drops. But three of them failed in the seventh game, more or less gifting the favourite the first set.
Dementieva fought back well from 0-40 in the opening game of the second set, but it was almost the last time she seemed likely to get back on terms.
She was soon another break down, and by now her second serve, which finished the match with only an 18 percent success ratio, was starting to look particularly vulnerable.
When Dementieva tried a gambler's approach shot on break point in the fifth game and was passed to go 1-4 down, the match was effectively over.
Earlier the only player capable of toppling Wozniacki from the top spot, Vera Zvonareva, won well.
The Wimbledon and US Open finalist from Russia dropped only three games against Jelena Jankovic, the former world number one from Serbia, who looked well below par.
Jankovic has been suffering from sinus problems, and was sweating very heavily throughout. After losing the first set she no longer presented a serious challenge.
The seventh, eighth and ninth games, all of them going to several deuces, were crucial.
Had Jankovic broken back at 3-4 the course of the contest might have been different, but Zvonareva too often struck the ball smoothly and usually punished anything short.
Jankovic had three points to reach 4-5, but after serving a double fault to concede the first set she appeared to lose heart and subsided quickly.
Later Jankovic had intravenous therapy, fluids being inserted straight into a vein, as she continued to feel affected by the illness she contracted last week.
"I had difficulty breathing during the match, felt dizzy and tingling and didn't have any power," she said.
"I finished the match but had a really hard time. There were moments when I gel I was going to give up."
Zvonareva was pleased with her win but she saw room for improvement.
"I managed to go for my shots from the start but I made more of them in the second set," said Zvonareva after her 6-3, 6-0 success.
"But I still have to improve my consistency, a little bit on my serve and also with my returns. That is the most important thing," she concluded.
The result maintained Zvonareva's outside chance of snatching the year-end world number one ranking after the finest season of her career.
But this will require Wozniacki to lose tomorrow's encounter against Samantha Stosur, the world number five from Australia -- and on current form that looks unlikely.
