Serena Williams and Naomi Osaka boast quite the impressive career resumes.  On one end of the court you have Serena Williams, a 23-time grand slam winner who has held the WTA number 1 ranking for 319 weeks including a joint-record 186 consecutive weeks.  On the other end of the court is Naomi Osaka, a 4-time grand slam winner and the first Asian player to ever obtain the WTA number 1 ranking in the world in singles.  When Naomi Osaka and Serena Williams faced each other in a grand slam for the first time at the final in the US Open in 2018 the stakes were never higher.  In a hotly contested matchup Osaka beat Williams in straight sets 6-2, 6-4, the match was the most watched match of men or women on television in the 2018 US Open.  While Naomi Osaka would go on to claim her first of four grand slams she would deny Serena Williams a chance at her 24th. Osaka and Serena have autographed this limited edition (10) jumbo 9” Wilson tennis ball in black paint pen. Their signatures are deemed authentic by virtue of Upper Deck Authenticated’s Five-Step Process.