Williams is now 7-0 all-time in Australian Open semifinals and moved to 9-0 against Radwanska over the course of her career.
With the roof at Rod Laver Arena closed because of some serious downpours in Melbourne, Williams put her foot on the gas and didn't let up.
In fact, Williams broke Radwanska to start the match and jumped out to an easy 4-0 lead in the first set, as ESPN's Brad Gilbert noted on Twitter:
Brad Gilbert @bgtennisnation
Tremendous start from SW21 vs Ninja Agi Rad, the only thing the AR can hope for is SW21 level drops if not this is total 1 way traffic2016-1-28 02:59:41
The first set proved to be a struggle for Radwanska as she got blanked by the world's top-ranked player. Williams consistently took advantage of Radwanska's slow first serves and imposed her will whenever she saw fit with some wicked winners.
According to the Australian Open's live stat tracker, Williams dominated the first set because Radwanska was only able to win 25 percent of her first-serve points. In fact, Radwanska won a grand total of seven—yes, seven—points in the first set.
Gilbert broke down the disparity in effectiveness following Williams' clinical opening statement that paved the way for her eventual victory:
Brad Gilbert @bgtennisnation
That was a total blowout 24-7 on points for SW21, Ninja Agi Rad must ask umpire right now for a mulligan or is it ok to continue on2016-1-28 03:08:18
That said, the second set didn't come without some tense moments. Radwanksa finally broke Williams and took a 4-3 lead—a development that appeared to swing momentum in her favor. With a more composed demeanor, a steadier serve and improved zip on her groundstrokes, Radwanska finally resembled the player who entered the semifinal on a tear.
But it was too little, too late, despite a handful of unforced errors from the favorite. Serena eventually broke back to take a 5-4 second-set lead and calmly closed things out on serve.
The New York Times' Ben Rothenberg described the quality that separated Williams from Radwanska:
Ben Rothenberg @BenRothenberg
Serena breaks for 5-4 in the second and will serve for the win. Footwork purposeful and great by Serena today, to keep her unwobbly.#AusOpen2016-1-28 03:47:33
All told, Serena won 88 percent of her first-serve points and posted a ridiculous 42-4 advantage in total winners as she cruised into the Australian Open final against arguably one of the hottest players in the field.
Radwanska entered the semifinal with 10 straight wins to start the season, and her straight-set stylings against four of five opponents at the Australian Open prior to the Serena showdown offered hope that she would put up a good fight.
However, history was on Williams' side. In their previous eight meetings, Serena had won 16 of 17 sets, and the start of a new season following an extended layoff seems to have revitalized her competitive spirit.
Now Serena is slated to defend her title against the winner of Thursday's other semifinal featuring seventh-seeded Angelique Kerber and the unranked Johanna Konta.
But regardless of which player advances to try to down the most unstoppable force the women's game has to offer, Williams figures to be a heavy favorite as she aims to capture Australian Open title No. 7 and her 22nd Grand Slam.
ESPN Tennis on Twitter provided a detailed look at the journey Williams is on:
The search for #22 continues. @serenawilliams #AusOpen #ESPNTennis https://t.co/V0vBvF5MaB2016-1-28 04:05:48
The American also broke down how she was able to overcome Radwanska's comeback attempt in the second set, per the Australian Open on Twitter:
"She started playing really well in the 2nd set... I just started playing aggressive again & it worked out.” Serena https://t.co/iBYsd7ASb52016-1-28 03:57:04
"Physically, I'm feeling a lot better, and mentally I needed that break after the U.S. Open," Williams said during her on-court interview at Rod Laver Arena, per WTATennis.com. "But I didn't think I'd be doing so much, so fast."
"I’m really excited to be in another final," Williams added, per the Australian Open on Twitter. "It just kind of blows my mind right now."