Soccer has No. 10. It's hard to beat No. 24 or No. 42 in baseball. In basketball, the No. 23 is reserved only for those who have or hope to have legendary status. For the past 35 years, 23 has graced jerseys from youth leagues to the NBA and all around the world thanks to Michael Jordan. He began wearing the number in high school in reference to his older brother Larry, who wore No. 45. Michael said he picked 23 because he aspired to be half the player Larry was. So when tennis superstar Serena Williams captured Grand Slam singles title No. 23 at the 2017 Australian Open, one of the first people to congratulate her was one Michael Jordan. The Hall of Fame guard presented Williams with a personalized colorway of these Nike Court Air Jordan shoes made specifically to match the shoes she normally wears on the court. They honor the feat that tied her with Margaret Court for the most ever Grand Slam singles titles in the Open era. Jordan and Williams have autographed these limited edition (23) red and black Nike Court Flare Air Jordan1 shoes in silver paint pen. Their signatures are on the right shoe, and Williams has added the inscription '23.' Their signatures and Williams' inscription are deemed authentic by virtue of Upper Deck Authenticated's Five-Step Process.