Maracana SA chief executive Severiano Braga said one section of the pitch had already been replaced with positive results.
The proposed new regulation are only applied to 400m, hurdle races and 800m, which Semenya dominates. Enditem
The third seeds were forced into a final-set tiebreak, where they saved a match point, before overcoming Muhammad and Townsend in a tremendous tussle 6-4, 3-6, 7-6 (9-7) and booked their ticket to the final.
"My waist disc herniation has been acting up again," she said, adding that she would be back next year.
Luneng were dealt a blow in the 20th minute as Marouane Fellaini picked up an injury, making way for Roger Guedes.
Around 800 fans witnessed the opening ceremony and the opening match. Newly promoted Chengdu Xingcheng Habitat beat Beijing Renhe 3-2 to bag a winning start.
"It's already dangerous enough, and I was really surprised and shocked at the moment that I felt something," the Belgian rider added.
It added that a meeting would be held with FIFA officials on Tuesday to address issues related to the competition "at the highest level."
Ahead of the Bavarian's first league game of the season this Friday evening against the FC Schalke 04, its staffing plans have stalled.
Zu Shanfa, head referee of the tournament, said the competition provides a platform for the students to keep fitness and to improve their football skills.
Rafinha joined Flamengo from Bayern Munich in June last year and helped the Rio de Janeiro club secure a historic Copa Libertadores-Brazilian Serie A double five months later.