Williams drew level with Germany's Graf on 22 major singles titles at last year's Wimbledon, but then lost in the semi-finals of the US Open. Since the beginning of 2015 she has reached at least the fourth round at seven of her past nine major tournaments - quarterfinals at the Australian and US Opens in 2015 gave way to a semifinal finish at Wimbledon previous year. She also learned in 2011 she had the immune system disorder called Sjogren's syndrome. "There was never a moment where she wasn't just hitting the ball incredible and striking the ball with just such precision".
She said: "I probably just need to continue playing like I'm playing".
The Williams sisters play Saturday in Melbourne at 3:30 a.m. "Especially here in Melbourne, this is my first Grand Slam win and to get to 23 here is rather special, especially against Venus". Venus took two and a half hours to overcome CoCo Vandeweghe in three sets, while Serena took just 50 minutes to despatch Mirjana Lucic-Baroni, dropping three games in a 6-2 6-1 demolition. "It hasn't settled in that I won yet". Together, the sisters have won 13 Grand Slam doubles titles.
Serena beat sister Venus in straight-sets 6-4, 6-4 in the Rod Laver Arena on Saturday to reclaim her place as the world No 1.
"I really elevated my game somehow", she told ESPN after the match.
"There's no way I could be at 23 without her", Serena, 35, said of her sister.
"I think now more so than anything".
"(I'm) ready to kill it this year", Venus added.
"Thank you for inspiring me to be the best player I can be". I know that she definitely wants to see me do the best that I can do.
Serena closed with an emotionally-charged 6-4 6-4 victory.
"I was thinking when I was out there, 'Gosh, my Dad would be very upset at the way we're both playing right now, ' " Serena said.
The third-seeded Bob and Mike Bryan were trying to win their 17th Grand Slam title, which would have tied them with John Newcombe for the most titles all-time.