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• Osaka one of four former champions handed US Open wildcards

  Two-time champion Naomi Osaka and fellow former winners Stan Wawrinka, Dominic Thiem and Bianca Andreescu were given wildcards for the upcoming US Open. 

  Osaka, who lost in the final round of qualifying for the Cincinnati Open, won the first of her four grand slam titles at Flushing Meadows in 2018, winning again two years later. 

  The former world number one returned to the tour this season after giving birth last year, but has struggled to find the form that led her to climb to the top of the rankings. 

  The Japanese is now ranked 90th in the WTA rankings, with her best finishes coming in Doha and 's-Hertogenbosch where she reached the quarter-finals in both. 

  She will be joined in the women's singles by Canada's Andreescu, who was crowned the US Open champion after her win over Serena Williams in 2019. 

  The 24-year-old returned to action this year after missing nine months due to a back injury and reached the French Open third round in her first event back.

  Meanwhile, Thiem headlines the wildcards in the men's singles in what will be the final grand slam of his career after confirming he will retire at the end of the season. 

  The Austrian won the US Open in 2020 in an epic five-match thriller against Alexander Zverev, but has failed to his best form after sustaining a wrist injury three years ago. 

  Also returning thanks to a wildcard is Wawrinka, eight years on from when he claimed the title in New York against Novak Djokovic at Flushing Meadows. 

  The 39-year-old's triumph in the United States was the latest of his three career grand slams, having previously prevailed at the Australian Open and French Open. 

• Lehecka stuns Medvedev to reach last 16 of Cincinnati Open

  Daniil Medvedev suffered consecutive opening game losses as he was dumped out of the Cincinnati Open by Jiri Lehecka in straight sets. 

  Medvedev, who was beaten by Alejandro Davidovich Fokina in Montreal last week, endured another early exit, losing 7-6 (7-2) 6-4 in just under two hours against the Czech.

  “It’s amazing to be back, to be honest. To get a win against such a talented player as Daniil surely is, is just such a bonus for me," Lehecka said on being back in his first tournament in three months after injury.

  Lehecka squandered four game points in the opener, with Medvedev also missing an opportunity for an early break, but the Czech was able to hold his opening serve. 

  The pair traded blows for the remainder, but the world number five struggled in the tiebreak, losing three games in a row to hand Lehecka the advantage. 

  And the decisive moment came in the seventh game of the second, as Lehecka broke Medvedev's serve, edging closer to a memorable triumph. 

  The Czech missed four match points in the final two games, but was not to be denied a fifth time, ending the encounter with a fierce serve to set up a meeting with Frances Tiafoe in the next round. 

  Data Debrief: Lehecka continues winning return in Cincinnati

  Since 1990, Lehecka is now the fourth player ranked outside the ATP's top 30 to claim top five wins at three ATP Masters 1000 events in a season after Gaston Gaudio (2001), Hicham Arazi (2001) and Tommy Paul (2022). 

  Excluding the ATP Tour Finals, Medvedev has been defeated in three consecutive ATP matches on hard court for the first time since October in 2017.

• Sinner passes Michelsen test in Cincinnati opener

  Jannik Sinner began his Cincinnati Open campaign with a hard-fought 6-4 7-5 win over Alex Michelsen, bouncing back from his injury scare at the Canadian Open last week.

  Sinner fell to a quarter-final defeat to Andrey Rublev in Montreal last time out, appearing to struggle with a hip issue throughout that loss after missing the Paris Olympics due to a bout of tonsillitis. 

  However, the Italian played down any concerns over his fitness ahead of his last-32 match in Cincinnati, where he was pushed all the way by Michelsen but held firm to advance.

  Sinner had to save eight break points in one hour and 52 minutes on court, committing as many unforced errors (19) as his American opponent.

  However, breaks in the very first game of the opener and the penultimate game of the second set proved decisive for the Australian Open winner, who will now face either Sebastian Baez or Jordan Thompson for a quarter-final place.

  Meanwhile, Stefanos Tsitsipas bounced back from his first-round Canadian Open exit at the hands of Kei Nishikori, fighting from a set and a break down to beat Jan-Lennard Struff 4-6 6-4 6-3.

  Speaking after his win, Tsitsipas – who will face Jack Draper or Jaume Munar next – said: "I was down a break, and I managed to keep on fighting and get the break back. 

  "Suddenly I felt like I was starting to figure out what really worked behind his serve. He made a few double faults, and I took that chance, got myself in the lead, and I think once I started reminding myself of my best qualities as a player, these things really started working."

  Data Debrief: Sinner looking to stay perfect

  Sinner's victory improved his record on hard courts to 25-2 for the season, and a first quarter-final berth at Cincinnati is now within his sights.

  He has reached at least the last eight at all five ATP 1000 Masters tournaments he has played this year, though his only such title came in Miami in March.