Having lost to Errani and Vinci in the quarterfinals of this year's Australian Open, the Williams sisters came out swinging from the beginning this time, saving the only break point they faced and breaking the co-World No.1s four times en route to a comprehensive one-hour, five-minute, 63 61 victory.
"We're really excited," Serena said. "They beat us the last time we played, they're playing so well and they're the No.1 team, so we went in there with low expectations, and just trying to have fun.
"We weren't thinking about revenge - we were just thinking about what we could do to win the match."
Everyone knows about the Williams sisters' incredible record in Grand Slam doubles finals - they are 13-0 - but they also have an incredible record in the next round, going 13-1 in Grand Slam doubles semifinals. And they've won the last 13 of those, their only loss in the doubles semifinals of a Grand Slam coming way back at the 1999 Australian Open to Lindsay Davenport and Natasha Zvereva.
And the semifinals are all they're thinking about right now. "We're not thinking about the final," Serena said. "We're shocked we've gotten this far - it's only our second tournament of the year in doubles, so we're just happy to still be in the tournament and we're just thinking about tomorrow's semifinal."
Barty and Dellacqua are now through to their third Grand Slam doubles final of the year, having been runners-up at the Australian Open (to Errani and Vinci) and Wimbledon (to Hsieh Su-Wei and Peng Shuai). Reaching three Grand Slam doubles finals in the same year doesn't seem to be such a rare feat lately, though - Errani and Vinci actually did it themselves just last year (the Italians were runners-up at the Australian Open and champions at both the French Open and US Open last year).