What to know

• Czech Katerina Siniakova and Britain’s Henry Patten took down the heavyweight pairing at Flushing Meadows.S1
• Aryna Sabalenka and Novak Djokovic will have to hope to win another U.S. Open singles title.S2
• Former world number one Novak Djokovic and four-time Grand Slam champion Aryna Sabalenka were sent tumbling out of the US Open's mixed doubles tournament on Tuesday by Czech Katerina Siniakova and Britain's Henry Patten.S3
• Novak Djokovic and Aryna Sabalenka were pushed into a much tougher match than they expected Tuesday.S4
• The US Open kicks off with a host of all-star pairings in mixed doubles action including Serena Williams teaming up with Carlos AlcarazS5