Dominik Koepfer News
Murray, ranked 144, had been given a wild card but while the 34-year-old lacked killer instinct, he did show steely determination to battle back from a set and a break down to take the match to a third set before Koepfer won 6-4, 5-7, 7-6 (11/9).
The 26-year-old British number one has been one of the most impressive performers on the circuit this year rising to 13th in the rankings released on Monday having begun the year 71st in the world.
Cincinnati Masters: Andy Murray returns to ATP Tour with win over Richard Gasquet; Diego Schwartzman beats Dan Evans
Murray, who owns two titles at Cincinnati and played 2016 final, has been struggling over the summer with a groin strain.
Jannik Sinner, ranked 15th, came good in Cincinnati as he defeated Argentine Federico Delbonis 6-2, 7-5.
Federer, who underwent two knee surgeries in 2020, and is playing only his third tournament since last year's Australian Open, has always said Wimbledon is his priority this year.
Djokovic, bidding to be the first man in more than half a century to win all four majors on multiple occasions, can reach the last 16 for a 12th consecutive year with victory over the sea-loving Lithuanian.
Federer, the oldest man in the draw at 39, lost his cool and the set before recovering to defeat former world number three Cilic.
Andujar beat the 2020 French Open boys' champion 4-6, 6-4, 6-4 after Stricker became the youngest player from his country to reach an ATP quarter-final since Federer at Copenhagen in 2000.
The world number five from Greece will take on Italian qualifier Lorenzo Musetti, who defeated fifth-seeded Bulgarian Grigor Dimitrov 6-4, 7-6 (7/3).
French Open 2020 Round-up: Rafael Nadal eases past Mackenzie McDonald; injury forces Serena Williams withdrawal
Azarenka hit 38 unforced errors in a 6-2, 6-2 defeat against a player who hadn't won a Grand Slam match in five years before her first-round victory over Venus Williams.
Italian Open 2020: Novak Djokovic loses his cool again weeks after US Open default; Simona Halep in semis
When Djokovic was broken at love to even the second set at 3-3, he slammed his racket to the red clay in anger. With the frame broken and the strings all mangled, Djokovic received a warning from the chair umpire.
Halep was ahead 6-2, 2-0 when Putintseva decided she was in too much pain to continue - having already taken an off-court medical timeout between sets.
Italian Open 2020: French star Gael Monfils subjected to barrage of online racist abuse after second-round exit
Often Monfils, 35, responds to frequent abuse directed at him and his family with emojis of black hands.
Australian Open 2020: Rafael Nadal begins tournament with easy win; 'Next Gen' star Jannik Sinner makes successful debut
The 33-year-old Nadal dropped a service game once in each of the first two sets but was too dominant for No. 73-ranked Dellien
US Open 2019: Daniil Medvedev calls himself an 'idiot' for making obscene gesture at chair umpire during his third-round match
Medvedev says he is still working on being his best but learned some lessons after reading social media comments about himself after Friday's match
US Open 2019: Daniil Medvedev fined $9000 for obscene gesture in third-round match against Feliciano Lopez
It marked the third consecutive match with a fine for Medvedev, who was docked $7,500 from his first match and $2,500 from his second
US Open 2019: Daniil Medvedev says he will do 'better next time' after angering fans with middle-finger gesture
Daniil Medvedev said he was working to do 'better next time' after his middle-finger gesture angered the crowd during his third-round match at the US Open.
US Open 2019: Unheralded German qualifier Dominik Koepfer relishing 'unreal' run at Flushing Meadows
Dominik Koepfer arrived at the US Open with just two career tour-level wins, but he has eclipsed that total in New York with his stunning run to the last 16.