After leading two sets to one, Sinner couldn't finish the match, and his disappointment was clear in his post-match comments, where he said that the defeat hurt him ‘a lot.’
Daniil Medvedev earned a personal-best 64th tour-level win of the season when he defeated long-term rival Stefanos Tsitsipas 6-4, 7-6(6) to reach the Vienna Open final for the second consecutive year.
Playing his first ATP Tour match in more than three months, World No. 2 Carlos Alcaraz made a winning return to competition at the Argentina Open. beating Laslo Diere in a Round of 16 match.
One year after lifting his first ATP Tour trophy in Adelaide, Australia's Thanasi Kokkinakis made a winning start in another campaign at the Adelaide International 2 ATP Tour event here on Monday.
The Italian missed the clay season after undergoing a minor operation on his right hand in late March but has played like he has never been away in Stuttgart, improving to 28-6 on grass.
Into its third edition, this year's Laver Cup will be played in Geneva between September 20 and September 22. There will be no ranking points available, but its status as an ATP event means it will be getting the same logistical support and back-up as other events on the tour.
The Spaniard grabbed his first title of the season, avenging his loss to the top-ranked Serb at the Australian Open.
The 1.7-meter (5-foot-7) Schwartzman is known as one of the best counterpunchers on the ATP Tour, but on Saturday he consistently tried to take the initiative and also made effective use of the drop shot after pushing Djokovic out of position.
Federer said he was not on top of what was going on but planned to speak with his colleagues about it.
The Argentine player will continue to rest, as his doctors have instructed on Sunday.
