"I personally presented my letter of resignation to the general secretary of the Ghana Football Association. It has been great serving the football governing body in various capacities in the last 10 years. But I believe it is time for me to move on for a new challenge," the 38-year-old said in a social media post.
Fourth-seeded Matteo Berrettini outlasted Stefano Travaglia 7-6 (5), 7-6 (1) in an all-Italian contest to reach the last eight.
Hoffenheim's wastefulness was punished moments later after Jan Thielmann's long ball into the box found new arrival Sebastian Andersson, who headed home the equalizer against the run of play.
"The dates of the first matches - October 8 and 13 - were ratified at the meeting, while President Infantino expressed FIFA's willingness for all national teams to be on equal terms," CONMEBOL said in a statement.
"Pursuing dreams is where 'Linsanity' originates, also the focal point for cooperation between the club and Lin," the Beijing club said, while expressing its understanding and respect towards Lin's decision.
Li Shenglong's fantastic diving header threw SIPG into the second round after collecting Civanildo Souza (Hulk)'s corner kick.
The Rubro-Negro won their opening two matches of South America's premier club competition before it was halted in March because of the coronavirus pandemic.
Nishikori needed six match points to seal the win in two hours at the ATP Masters event held behind closed doors at the Foro Italico.
In other fixtures on Saturday, Bragantino beat Ceara 4-2 and Fortaleza overcame Internacional 1-0. Enditem
The 2019 edition of the FIVB Men's and Women's Volleyball Club World Championships were held by Brazil and China respectively, with Italian clubs Lube Civitanova and Imoco Volley claiming gold. Enditem
The Asian Games bronze medalist assigned her strength strategically all the way, in the last 600 meters, three runners took turns to lead, with Zhang winning the sprint finish. "I am from Yunnan province, training at high altitude has built up my endurance, and my strategy worked well today."