Yan Yuxiang from Shandong took first place in the men's 200m butterfly in 2:00.18, with Tianjin's Wu Guangshuai and Hunan's Wang Kecheng rounding out the top three.
That performance has put Athletic coach Gaizka Garitano under pressure and both he and Machin need wins to assure they are still in their jobs after the international break.
Starting from pole position, Zhou kept his lead in the opening stages of the race while others jockeyed for position behind him.
Olympic medalist Wang Shun reached the finishing line first in the men's 400m individual medley in 4:11.89.
Two newly-promoted sides weren't as fortunate as Qingdao Huanghai and Shijiazhuang Ever Bright need to fight against relegation, along side Tianjin Teda.
MADRID, Sept. 30 (Xinhua) -- Spanish La Liga club Granada have to put Sunday's disastrous performance away to Atletico Madrid behind them if they are to book a place in the group stage of the Europa League on Thursday evening.
Yan established an advantage from the very beginning, leading runner-up Yu Zongda, also from Hubei, by nearly two seconds in the first 50 meters. Huang Chaosheng from Hunan finished third.
Real Madrid has won without really impressing at the start of the season and Zinedine Zidane will again have selection questions to answer when his side visits Levante. Eden Hazard is out for several weeks, but Vinicus Jr made his case to start with his winning goal at home to Valladolid on Wednesday.
World champion Xu Jiayu from Zhejiang clinched his second gold in the men's 100m backstroke in 52.60 seconds, after his 200m backstroke victory on Sunday.
The Brazilian giants are guaranteed of advancing to the last 16 regardless of the result of their final group match against Argentina's Defensa y Justicia on October 20.
If Villarreal coach Unai Emery was unhappy at the space his side left Barca in the opening goal, he will have been furious as Fati doubled his tally just four minutes later.