The Williams broke Huber’s serve to open the second set Friday and won the match when they again broke Huber, ending it on Serena’s winning reflex volley. The sisters high-fived each other at the side of the court after the match.
The Williams sisters won the Australian title for the first time in 2001 and added championships in 2003 and last year. Black, from Zimbabwe, and Huber, a South African-born American citizen, won the 2007 title.
“I have to congratulate Venus and Serena for a great tournament — you guys are too good,” Black said.
It was the 11th time the Williams sisters have combined for a Grand Slam doubles title.
Serena has 11 singles majors, also, and is hoping for a 12th in the Australian Open final on Saturday against Justine Henin.
“I look forward to more titles,” Serena Williams said.
The Williams sisters broke to go up 4-3. Serena Williams faced two break points on her serve in the next game before she held.
With Venus Williams serving for the set, the sisters took the opener when Black netted a forehand on a second set point.
Venus Williams also has won a mixed-doubles title at the Australian Open — in 1998 with fellow American Jason Gimelstob. Serena Williams was a losing finalist in mixed doubles with Max Mirnyi of Belarus in 1999.
Black is still in this year’s mixed-doubles tournament, playing the semifinals later with Leander Paes of India against Lisa Raymond of the United States and Wesley Moodie of South Africa. Paes and Black are the top-seeded team.