The Brazilian, who had entered the game as a substitute, took advantage of a loose ball to beat Valladolid keeper Roberto Jimenez with a diagonal shot.
At the same time, after entering the relegation group, Guangzhou R&F will try to secure its next season's CSL ticket in the second session games.
Behind the top three, Racing Point's Sergio Perez finished a strong fourth ahead of Daniel Ricciardo's Renault, and Charles Leclerc had a good run to sixth in his Ferrari ahead of Ricciardo's teammate Esteban Ocon.
The top four teams from the first phase Suzhou and Dalian zones respectively will move into Final A to determine the eventual league champions and the top eight rankings. The bottom four teams from the Suzhou and Dalian zones will enter Final B to battle against relegation to the second-tier League One.
31-year-old Sunjic, who stands 1.94m tall, has played for many clubs across Europe, including VfB Stuttgart, S.S.D. Palermo and FC Dynamo Moscow. He also represented his country in the 2014 FIFA World Cup in Brazil.
The Championship League has been expanded to a full World Snooker Tour ranking event this season, featuring 128 players in three stages over 21 days.
After a goalless first half, Evergrande broke the deadlock just three minutes after the break, as Ai Kesen's header took a deflection off Shan Pengfei's head to go beyond a helpless goalkeeper Xu Jiamin.
James Maddison and Youri Tielemens also scored for Leicester with Nathan Ake scoring an 84th minute goal for the home side, who were without Aymeric Laporte and in Ake and Eric Garcia played two central defenders each below six feet in height.
Zhejiang bagged all three medals in the men's 100m butterfly, as Hong Jinquan clinched the gold in 53.03 seconds.
Stage One involves 32 groups of four players, with the player who tops each group progressing to Stage Two.
Monday's first game saw Fulham outclassed at home by Aston Villa. The side that won promotion to the top-flight two seasons ago, outplayed the team that did the same last season with goals from Jack Grealish after four minutes, Conor Hourihane 11 minutes later and Tyrone Mings three minutes after the break.