Newly-promoted Stuttgart inflicted Mainz's second loss in as many games, as goals from Silas Wamangituka, Daniel Didavi, Mateo Klimowicz and Sasa Kalajdzic secured a 4-1 victory.
The 41-year-old coach was in charge of Bundesliga outfit Augsburg from December 2016 to April 2019, before coaching Germany's U-20 and U-18 national teams.
British-born defender Jiang Guangtai, whose English name is Tyias Browning and Brazilian-born striker Fei Nanduo, Fernando, both play for Guangzhou Evergrande. The Chinese Super League defending champions have six players called up to the national team.
Mexico will meet the Netherlands in Amsterdam on October 7 and Algeria in the Hague six days later.
One player who is likely to miss out however, is striker Luka Jovic. The Serb was given a chance to show what he can do at the weekend, but produced another disappointing display (although he did provoke a red card for Betis defender Emerson). Everything points to Jovic being loaned out before the end of the season with Borja Mayoral remaining as backup to Karim Benzema.
Kenyatta, who was opening the refurbished Nyayo National Stadium in Nairobi, said the redevelopment of that stadium is not an isolated case.
Tianjin rode an early 8-0 spurt to race ahead, and compiled a 25-19 advantage as the first quarter ran out.
Olympic medalist Wang Shun reached the finishing line first in the men's 400m individual medley in 4:11.89.
Cedric Bakambu finished second with a stunning strike in the 27th minute after a goal was disallowed for offside in the opening time.
Flamengo entered the match with only three regular starters, having reported 16 positive coronavirus cases in their first-team squad last week. Head coach Domenec Torrent was also absent from the touchline at Allianz Parque because of the virus.
The 2020 German Supercup final is developing into a vital do-or-die game.